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# Awesome C++ [](https://awesome.re) [](https://www.trackawesomelist.com/fffaraz/awesome-cpp/)
A curated list of awesome C++ (or C) frameworks, libraries, resources, and shiny things. Inspired by awesome-... stuff.
- [Awesome C++](#awesome-cpp)
- [Standard Libraries](#standard-libraries)
- [Frameworks](#frameworks)
- [Artificial Intelligence](#artificial-intelligence)
- [Asynchronous Event Loop](#asynchronous-event-loop)
- [Audio](#audio)
- [Biology](#biology)
- [BitTorrent](#bittorrent)
- [Chemistry](#chemistry)
- [CLI](#cli)
- [Compression](#compression)
- [Concurrency](#concurrency)
- [Configuration](#configuration)
- [Containers](#containers)
- [Cryptography](#cryptography)
- [CSV](#csv)
- [Database](#database)
- [Data visualization](#data-visualization)
- [Debug](#debug)
- [Font](#font)
- [Game Engine](#game-engine)
- [GUI](#gui)
- [Graphics](#graphics)
- [Image Processing](#image-processing)
- [Internationalization](#internationalization)
- [Inter-process communication](#inter-process-communication)
- [JSON](#json)
- [Logging](#logging)
- [Machine Learning](#machine-learning)
- [Math](#math)
- [Memory Allocation](#memory-allocation)
- [Multimedia](#multimedia)
- [Networking](#networking)
- [PDF](#pdf)
- [Physics](#physics)
- [Reflection](#reflection)
- [Regular Expression](#regular-expression)
- [Robotics](#robotics)
- [Scientific Computing](#scientific-computing)
- [Scripting](#scripting)
- [Serialization](#serialization)
- [Sorting](#sorting)
- [Video](#video)
- [Virtual Machines](#virtual-machines)
- [Web Application Framework](#web-application-framework)
- [XML](#xml)
- [Yaml](#yaml)
- [Miscellaneous](#miscellaneous)
- [Software](#software)
- [Compiler](#compiler)
- [Online Compiler](#online-compiler)
- [Debugger](#debugger)
- [Integrated Development Environment](#integrated-development-environment)
- [Build Systems](#build-systems)
- [Static Code Analysis](#static-code-analysis)
- [Coding Style Tools](#coding-style-tools)
- [Resources](#resources)
- [API Design](#api-design)
- [Articles](#articles)
- [Books](#books)
- [Coding Style](#coding-style)
- [Podcasts](#podcasts)
- [Talks](#talks)
- [Videos](#videos)
- [Websites](#websites)
- [Other Awesome Lists](#other-awesome-lists)
- [Jobs](#jobs)
- [Sponsors](#sponsors)
- [Contributing](#contributing)
## Standard Libraries
*C++ Standard Library - including STL Containers, STL Algorithm, STL Functional, etc.*
* [C++ Standard Library](https://en.wikipedia.org/wiki/C%2B%2B_Standard_Library) - A collection of classes and functions, which are written in the core language and part of the C++ ISO Standard itself.
* [Standard Template Library](https://en.wikipedia.org/wiki/Standard_Template_Library) - The Standard Template Library (STL).
* [C POSIX library](https://en.wikipedia.org/wiki/C_POSIX_library) - A specification of a C standard library for POSIX systems.
* [ISO C++ Standards Committee](https://github.com/cplusplus) - ISO/IEC JTC1/SC22/WG21 - The C++ Standards Committee. [website](http://www.open-std.org/JTC1/SC22/WG21/)
* [The GNU C Library](https://www.gnu.org/software/libc/manual) - The purpose of this manual is to tell you how to use the facilities of the GNU C Library.
## Frameworks
*C++ generic frameworks and libraries.*
* [abseil-cpp](https://github.com/abseil/abseil-cpp) - Abseil C++ Common Libraries. [Apache2]
* [Apache C++ Standard Library](http://stdcxx.apache.org/) - STDCXX, A collection of algorithms, containers, iterators, and other fundamental components. [retired] [Apache2]
* [APR](http://apr.apache.org/) - Apache Portable Runtime. Another library of cross-platform utility functions. [Apache2]
* [ASL](http://stlab.adobe.com/) - Adobe Source Libraries provides peer-reviewed and portable C++ source libraries. [MIT]
* [Boost](https://github.com/boostorg) :zap: - A large collection of generic C++ libraries. [Boost] [website](http://www.boost.org/)
* [BDE](https://github.com/bloomberg/bde) - The BDE Development Environment from Bloomberg Labs. [Apache2]
* [C++ Workflow](https://github.com/sogou/workflow) - C++ Parallel Computing and Asynchronous Networking Engine. [Apache2]
* [CGraph](https://github.com/ChunelFeng/CGraph) - A cross-platform DAG framework based on C++ without any 3rd-party. [MIT]
* [Cinder](https://libcinder.org/) - A community-developed, free and open source library for professional-quality creative coding. [BSD]
* [Coost](https://github.com/idealvin/coost) - A tiny boost library in C++11. [MIT]
* [Cxxomfort](http://ryan.gulix.cl/fossil.cgi/cxxomfort/) - A small, header-only library that backports various facilities from more recent C++ Standards to C++03 and later. [MIT]
* [Dlib](https://github.com/davisking/dlib) :zap: - A toolkit for making real world machine learning and data analysis applications in C++ [Boost] [website](http://dlib.net/)
* [EASTL](https://github.com/electronicarts/EASTL) - Electronic Arts Standard Template Library. [BSD]
* [ETL](https://github.com/ETLCPP/etl) - Embedded Template Library. [MIT]
* [ffead-cpp](https://github.com/sumeetchhetri/ffead-cpp) - Framework for Enterprise Application Development. [Apache2]
* [Folly](https://github.com/facebook/folly) - An open-source C++ library developed and used at Facebook. [Apache2]
* [FunctionalPlus](https://github.com/Dobiasd/FunctionalPlus) - Functional Programming Library for C++. Write concise and readable C++ code. [MIT]
* [GLib](https://wiki.gnome.org/Projects/GLib) - GLib provides the core application building blocks for libraries and applications written in C. [LGPL]
* [JUCE](https://github.com/julianstorer/JUCE) - An all-encompassing C++ class library for developing cross-platform software. [Core-Module: ISC, Rest: GPL2/GPL3/Commercial] [website](http://www.juce.com/)
* [Kigs framework](https://github.com/Kigs-framework/kigs) - A free and open source C++ modular multi-purpose cross platform RAD framework. [MIT] [website](https://kigs-framework.org/)
* [libPhenom](https://github.com/facebook/libphenom) - libPhenom is an eventing framework for building high performance and high scalability systems in C. [Apache2]
* [LibSourcey](https://github.com/sourcey/libsourcey) - C++11 evented IO for real-time video streaming and high performance networking applications. [LGPL]
* [LibU](https://github.com/koanlogic/libu) - A multiplatform utility library written in C. [BSD]
* [libxutils](https://github.com/kala13x/libxutils) - Simple and yet powerful cross-platform C library providing data structures, algorithms and much more. [MIT]
* [Loki](http://loki-lib.sourceforge.net/) - A C++ library of designs, containing flexible implementations of common design patterns and idioms. [MIT]
* [MiLi](https://github.com/MariadeAnton/MiLi) - Minimal headers-only C++ Library. [Boost]
* [OpenFrameworks](https://github.com/openframeworks/openFrameworks) - A cross platform open source toolkit for creative coding in C++. [MIT] [website](http://www.openframeworks.cc/)
* [Qt](https://www.qt.io/download-open-source/) :zap: - A cross-platform application and UI framework. [GPL/LGPL/Commercial]
* [Reason](http://code.google.com/p/reason/) - A cross platform framework designed to bring the ease of use of Java, .Net, or Python to developers who require the performance and strength of C++. [GPL2]
* [ROOT](https://root.cern.ch/) - A set of OO frameworks with all the functionality needed to handle and analyze large amounts of data in a very efficient way. Used at CERN. [LGPL]
* [Seastar](https://github.com/scylladb/seastar) - An advanced, open-source C++ framework for high-performance server applications on modern hardware. [Apache-2.0 License] [seastar.io](http://seastar.io/)
* [STLport](http://www.stlport.org/) - An exemplary version of STL. [Free]
* [STXXL](http://stxxl.sourceforge.net/) - Standard Template Library for Extra Large Data Sets. [Boost]
* [tbox](https://github.com/tboox/tbox) - A glib-like multi-platform c library. [Apache2] [website](http://tboox.org/)
* [Ultimate++](http://www.ultimatepp.org/) - A C++ cross-platform rapid application development framework. [BSD]
* [uSTL](http://msharov.github.io/ustl/) - The small STL library. [MIT]
* [Windows Template Library](http://sourceforge.net/projects/wtl/) - A C++ library for developing Windows applications and UI components. [Public]
* [Yomm2](https://github.com/jll63/yomm2) - Fast, Orthogonal, Open multi-methods. Supersedes [Yomm11](https://github.com/jll63/yomm11) [Boost]
## Artificial Intelligence
* [ANNetGPGPU](https://github.com/ANNetGPGPU/ANNetGPGPU) - A GPU (CUDA) based Artificial Neural Network library. [LGPL]
* [btsk](https://github.com/aigamedev/btsk) - Game Behavior Tree Starter Kit. [zlib]
* [Evolving Objects](http://eodev.sourceforge.net/) - A template-based, ANSI-C++ evolutionary computation library which helps you to write your own stochastic optimization algorithms insanely fast. [LGPL]
* [frugally-deep](https://github.com/Dobiasd/frugally-deep) - Header-only library for using Keras models in C++. [MIT]
* [Genann](https://github.com/codeplea/genann) - Simple neural network library in C. [zlib]
* [MXNet](https://github.com/apache/incubator-mxnet) - Lightweight, Portable, Flexible Distributed/Mobile Deep Learning with Dynamic, Mutation-aware Dataflow Dep Scheduler; for Python, R, Julia, Scala, Go, Javascript and more [website](https://mxnet.apache.org)
* [PyTorch](https://github.com/pytorch/pytorch) - Tensors and Dynamic neural networks in Python with strong GPU acceleration. [website](https://pytorch.org)
* [flashlight](https://github.com/flashlight/flashlight) - Flashlight is a fast, flexible machine learning library written entirely in C++. [BSD]
* [Recast/Detour](https://github.com/recastnavigation/recastnavigation) - (3D) Navigation mesh generator and pathfinder, mostly for games. [zlib]
* [TensorFlow](https://github.com/tensorflow/tensorflow) - An open source software library for numerical computation using data flow graphs [Apache]
* [oneDNN](https://github.com/oneapi-src/oneDNN) - An open-source cross-platform performance library for deep learning applications. [Apache] [website](https://01.org/onednn)
* [CNTK](https://github.com/Microsoft/CNTK) - Microsoft Cognitive Toolkit (CNTK), an open source deep-learning toolkit. [Boost]
* [tiny-dnn](https://github.com/tiny-dnn/tiny-dnn) - A header only, dependency-free deep learning framework in C++11. [BSD]
* [Veles](https://github.com/Samsung/veles) - Distributed platform for rapid Deep learning application development. [Apache]
* [Kaldi](https://github.com/kaldi-asr/kaldi) - Toolkit for speech recognition. [Apache]
## Asynchronous Event Loop
* [Asio](https://github.com/chriskohlhoff/asio/) - A cross-platform C++ library for network and low-level I/O programming that provides developers with a consistent asynchronous model using a modern C++ approach. [Boost] [website](http://think-async.com/)
* [Boost.Asio](http://think-async.com/) - A cross-platform C++ library for network and low-level I/O programming. [Boost]
* [C++ Actor Framework](https://github.com/actor-framework/actor-framework) - An Open Source Implementation of the Actor Model in C++. [BSD-3-Clause] [website](http://actor-framework.org/)
* [Ichor](https://github.com/volt-software/ichor) - An event queue which focuses on thread safety and provides dependency injection. [MIT]
* [libev](http://libev.schmorp.de/) - A full-featured and high-performance event loop that is loosely modelled after libevent, but without its limitations and bugs. [BSD and GPL]
* [libevent](http://libevent.org/) - An event notification library. [BSD]
* [libhv](https://github.com/ithewei/libhv) - Cross-platform event loop library. [BSD]
* [libuv](https://github.com/libuv/libuv) - Cross-platform asynchronous I/O. [BSD]
* [promise-cpp](https://github.com/xhawk18/promise-cpp) - Header only library that implements Promise/A+ standard. [Anti-996]
* [uvw](https://github.com/skypjack/uvw) - C++ wrapper for libuv. [MIT]
## Audio
*Audio, Sound, Music, Digitized Voice Libraries*
* [AudioFile](https://github.com/adamstark/AudioFile) - A simple C++ library for reading and writing audio files. [MIT]
* [audioFlux](https://github.com/libAudioFlux/audioFlux) - A C library for audio and music analysis, feature extraction. [MIT]
* [dr_libs](https://github.com/mackron/dr_libs) - Single file audio decoding libraries for C and C++. [Unlicense]
* [FMOD](http://www.fmod.org/) - An easy to use crossplatform audio engine and audio content creation tool for games. [Free for non-commercial/Commercial]
* [KFR](https://www.kfrlib.com/) - Fast, modern C++ DSP framework, FFT, FIR/IIR filters, Sample Rate Conversion. [GPL/Commercial]
* [LAME](https://lame.sourceforge.io/using.php) - LAME is a high quality MPEG Audio Layer III (MP3) encoder. [LGPL]
* [libsndfile](https://github.com/erikd/libsndfile/) - C library with C++ wrapper for reading and writing files containing sampled sound through one standard library interface. [LGPL-2.1] [website](http://www.mega-nerd.com/libsndfile/)
* [libsoundio](https://github.com/andrewrk/libsoundio) - C library for cross-platform real-time audio input and output. [MIT] [website](http://libsound.io/)
* [Maximilian](https://github.com/micknoise/Maximilian) - C++ Audio and Music DSP Library. [MIT]
* [OpenAL](http://www.openal.org/) - Open Audio Library - A crossplatform audio API. [BSD/LGPL/Commercial]
* [miniaudio](https://github.com/mackron/miniaudio) - Single file audio playback and capture library. [Unlicense] [website](https://miniaud.io/)
* [ni-media](https://github.com/NativeInstruments/ni-media) - C++ library for reading and writing audio files. [MIT]
* [Opus](http://opus-codec.org/) - A totally open, royalty-free, highly versatile audio codec. [BSD]
* [PortAudio](http://www.portaudio.com/) - PortAudio is a free, cross-platform, open-source, audio I/O library. [MIT]
* [rnnoise](https://github.com/xiph/rnnoise) - Recurrent neural network for audio noise reduction. [BSD-3-Clause]
* [SELA](https://github.com/sahaRatul/sela) - SimplE Lossless Audio. [MIT]
* [SoLoud](https://github.com/jarikomppa/soloud) - Easy, portable audio engine for games. [zlib]
* [Speex](http://www.speex.org/) - A free codec for free speech. Obsoleted by Opus. [BSD]
* [Tonic](https://github.com/TonicAudio/Tonic) - Easy and efficient audio synthesis in C++. [Unlicense]
* [Vorbis](http://xiph.org/vorbis/) - Ogg Vorbis is a fully open, non-proprietary, patent-and-royalty-free, general-purpose compressed audio format. [BSD]
* [minimp3](https://github.com/lieff/minimp3) - Public domain, header-only MP3 decoder with clean-room implementation. [CC0]
* [Verovio](https://github.com/rism-ch/verovio) - Verovio is a fast and lightweight music notation engraving library. [LGPL] [website](https://www.verovio.org)
* [Wav2Letter++](https://github.com/facebookresearch/wav2letter/) - Public domain, a fast open source speech processing toolkit written entirely in C++ and uses the ArrayFire tensor library and the flashlight machine learning library for maximum efficiency [BSD]
## Biology
*Bioinformatics, Genomics, Biotech*
* [BioC++](http://biocpp.sourceforge.net/) - C++ Computational Libraries for Bioinformatics. [BSD]
* [Chaste](http://www.cs.ox.ac.uk/chaste/) - An open source C++ library for the computational simulation of mathematical models developed for physiology and biology. [BSD]
* [libsequence](http://molpopgen.github.io/libsequence/) - A C++ library for representing and analyzing population genetics data. [GPL]
* [SeqAn](http://www.seqan.de/) - Algorithms and data structures for the analysis of sequences with the focus on biological data. [BSD/3-clause]
* [Vcflib](https://github.com/ekg/vcflib) - A C++ library for parsing and manipulating VCF files. [MIT]
* [Wham](https://github.com/zeeev/wham) - Structural variants (SVs) in Genomes by directly applying association tests to BAM files. [MIT]
## BitTorrent
* [jech/dht](https://github.com/jech/dht) - BitTorrent DHT library in C. [MIT]
* [libtorrent](https://github.com/arvidn/libtorrent) (a.k.a. libtorrent-rasterbar) - An efficient feature complete C++ bittorrent implementation. [BSD]
* [LibTorrent](https://github.com/rakshasa/libtorrent) (a.k.a. libtorrent-rakshasa) - BitTorrent library. [GPL]
* [libutp](https://github.com/bittorrent/libutp) - uTorrent Transport Protocol library. [MIT]
## Chemistry
*Chemistry, Quantum Chemistry, Solid-State Chemistry/Physics, Geochemistry, Biochemistry*
* [d-SEAMS](https://github.com/d-SEAMS/seams-core) - A molecular dynamics trajectory analysis engine in C++ and Lua with Nix. It is an acronym for Deferred Structural Elucidation Analysis for Molecular Simulations. [GPL] [website](https://dseams.info)
* [gromacs](https://github.com/gromacs/gromacs) - A message-passing parallel molecular dynamics implementation. [GPL] [website](http://www.gromacs.org)
* [Reaktoro](https://github.com/reaktoro/reaktoro) - A computational framework in C++ and Python for modeling chemically reactive systems. [LGPL] [website](https://reaktoro.org)
* [LAMMPS](https://github.com/lammps/lammps) - A classical molecular dynamics code with a focus on materials modeling. It's an acronym for Large-scale Atomic/Molecular Massively Parallel Simulator. [GPL] [website](https://lammps.sandia.gov/)
* [MADNESS](https://github.com/m-a-d-n-e-s-s/madness) - Multiresolution Adaptive Numerical Environment for Scientific Simulation. [GPL] [website](https://github.com/m-a-d-n-e-s-s/madness)
* [MPQC](https://github.com/ValeevGroup/mpqc) - The Massively Parallel Quantum Chemistry program, MPQC, computes properties of atoms and molecules from first principles using the time independent Schrödinger equation. [GPL] [website](https://mpqc.org/)
* [ORCA](https://en.wikipedia.org/wiki/ORCA_(quantum_chemistry_program)) - An ab initio quantum chemistry program package that contains modern electronic structure methods. [Academic] [website](https://orcaforum.kofo.mpg.de/)
* [Psi](https://github.com/psi4/psi4) - An ab initio computational chemistry package. [GPL] [website](https://psicode.org/)
## CLI
*Console/Terminal User Interface, Command Line Interface*
* [Argh!](https://github.com/adishavit/argh) - A minimalist, frustration-free, header-only argument handler. [BSD]
* [Taywee/args](https://github.com/taywee/args) - A simple header-only C++ argument parser library. [MIT]
* [Boost.Program_options](http://www.boost.org/doc/libs/1_57_0/doc/html/program_options.html) - A library to obtain program options via conventional methods such as command line and config file. [Boost]
* [Clara](https://github.com/catchorg/Clara) - A simple to use, composable, command line parser for C++ 11 and beyond. [BSL-1.0]
* [cli](https://github.com/daniele77/cli) - A cross-platform header only C++14 library for interactive command line interfaces (Cisco style). [Boost]
* [CLI11](https://github.com/CLIUtils/CLI11) - Header only single or multi-file C++11 library for simple and advanced CLI parsing. [BSD]
* [clipp](https://github.com/muellan/clipp) - Easy to use, powerful and expressive command line argument handling for C++11/14/17 contained in a single header file. [MIT]
* [jarro2783/cxxopts](https://github.com/jarro2783/cxxopts) - Lightweight C++ command line option parser. [MIT]
* [docopt.cpp](https://github.com/docopt/docopt.cpp) - A library to generate option parser from docstring. [MIT/Boost]
* [FINAL CUT](https://github.com/gansm/finalcut) - Library for creating terminal applications with text-based widgets. [LGPL]
* [gflags](https://gflags.github.io/gflags/) - Commandline flags module for C++. [BSD]
* [indicators](https://github.com/p-ranav/indicators/) - Activity indicators for Modern C++. [MIT]
* [linenoise](https://github.com/antirez/linenoise) - A small self-contained alternative to readline and libedit. [BSD-2-Clause]
* [linenoise-ng](https://github.com/arangodb/linenoise-ng) - A small, portable GNU readline replacement for Linux, Windows and MacOS which is capable of handling UTF-8 characters. [BSD]
* [Lyra](https://github.com/bfgroup/Lyra) - A simple to use, composable, command line parser for C++ 11 and beyond. [Boost]
* [Ncurses](http://invisible-island.net/ncurses/) - A terminal user interface. [MIT]
* [oof](https://github.com/s9w/oof) - Convenient, high-performance RGB color and position control for console output. [MIT]
* [PDCurses](https://github.com/wmcbrine/PDCurses) - Public domain curses library with both source code and pre-compiled library available. [PublicDomain]
* [popl](https://github.com/badaix/popl) - A single-header templated command line arguments and ini file parser for C++ 11 and beyond. [MIT]
* [replxx](https://github.com/AmokHuginnsson/replxx) - A readline and libedit replacement that supports UTF-8, syntax highlighting, hints, works on Unix and Windows. [BSD]
* [tabulate](https://github.com/p-ranav/tabulate) - Table Maker for Modern C++ [MIT]
* [TCLAP](http://tclap.sourceforge.net) - A mature, stable and feature-rich library for defining and accessing command line arguments in ANSI C++. [MIT]
* [termbox](https://github.com/nsf/termbox) - A C library for writing text-based user interfaces. [MIT]
* [cpp-terminal](https://github.com/jupyter-xeus/cpp-terminal) - Small header only C++ library for writing multiplatform terminal applications. [MIT]
* [FTXUI](https://github.com/ArthurSonzogni/FTXUI) - C++ Functional Terminal User Interface. [MIT]
* [imtui](https://github.com/ggerganov/imtui) - Immediate Mode Text-based User Interface [MIT]
## Compression
*Compression and Archiving Libraries*
* [bit7z](https://github.com/rikyoz/bit7z) - A C++ static library offering a clean and simple interface to the 7-zip DLLs. [GPLv2]
* [Brotli](https://github.com/google/brotli) - Brotli compression format. Developed by Google. [MIT]
* [bzip2](http://www.bzip.org/) - A freely available, patent free, high-quality data compressor. [BSD]
* [bzip3](https://github.com/kspalaiologos/bzip3) - A better and stronger spiritual successor to BZip2. [LGPL]
* [FiniteStateEntropy](https://github.com/Cyan4973/FiniteStateEntropy) - New generation entropy codecs : Finite State Entropy and Huff0.
* [PhysicsFS](https://icculus.org/physfs/) - A library to provide abstract access to various archives. It is intended for use in video games, and the design was somewhat inspired by Quake 3's file subsystem. [zlib]
* [KArchive](https://api.kde.org/frameworks/karchive/html/index.html) - A library for creating, reading, writing and manipulating file archives like zip and tar. It also provides transparent compression and decompression of data, using formats like gzip, via a subclass of QIODevice. [LGPL]
* [libarchive](https://github.com/libarchive/libarchive) - Multi-format archive and compression library. [New BSD] [website](http://www.libarchive.org/)
* [LZ4](https://github.com/lz4/lz4) - Extremely Fast Compression algorithm. [BSD] [website](http://www.lz4.org/)
* [LZFSE](https://github.com/lzfse/lzfse) - LZFSE compression library and command line tool. Developed by Apple.
* [LZHAM](https://code.google.com/p/lzham/) - Lossless data compression library with a compression ratio similar to LZMA but with much faster decompression. [BSD]
* [LZMA](http://www.7-zip.org/sdk.html) :zap: - The default and general compression method of 7z format. [PublicDomain]
* [LZMAT](http://www.matcode.com/lzmat.htm) - An extremely fast real-time lossless data compression library. [GPL]
* [miniz](https://github.com/richgel999/miniz) - Single C source file Deflate/Inflate compression library with zlib-compatible API, ZIP archive reading/writing, PNG writing. [MIT]
* [Minizip](https://github.com/nmoinvaz/minizip) - Zlib with latest bug fixes that supports PKWARE disk spanning, AES encryption, and IO buffering. [zlib]
* [smaz](https://github.com/antirez/smaz) - Small strings compression library. [BSD]
* [Snappy](https://google.github.io/snappy/) - A fast compressor/decompressor. [BSD]
* [ZLib](http://zlib.net/) - A very compact compression library for data streams. [zlib]
* [zlib-ng](https://github.com/Dead2/zlib-ng) - zlib for the "next generation" systems. Drop-In replacement with some serious optimizations. [zlib]
* [zstd](https://github.com/facebook/zstd) - Zstandard - Fast real-time compression algorithm. Developed by Facebook. [BSD]
* [ZZIPlib](http://zziplib.sourceforge.net/) - Provides read access on ZIP-archives. [MPL/LGPL]
## Concurrency
*Concurrency and Multithreading*
* [alpaka](https://github.com/ComputationalRadiationPhysics/alpaka) - Abstraction library for parallel kernel acceleration. [LGPLv3+]
* [ArrayFire](https://github.com/arrayfire/arrayfire) - A general purpose GPU library. [BSD]
* [Async++](https://github.com/Amanieu/asyncplusplus) - A lightweight concurrency framework for C++11, inspired by the Microsoft PPL library and the N3428 C++ standard proposal. [MIT]
* [Boost.Compute](https://github.com/boostorg/compute) - A C++ GPU Computing Library for OpenCL. [Boost]
* [Bolt](https://github.com/HSA-Libraries/Bolt) - A C++ template library optimized for GPUs. [Apache2]
* [ck](https://github.com/concurrencykit/ck) - Concurrency primitives, safe memory reclamation mechanisms and non-blocking data structures. [BSD]
* [concurrentqueue](https://github.com/cameron314/concurrentqueue) - A fast multi-producer, multi-consumer lock-free concurrent queue for C++11. [BSD,Boost]
* [Cpp-Taskflow](https://github.com/cpp-taskflow/cpp-taskflow) - Fast C++ Parallel Programming with Task Dependencies. [MIT]
* [CUB](https://github.com/NVlabs/cub) - CUB provides state-of-the-art, reusable software components for every layer of the CUDA programming mode. [New BSD]
* [cuda-api-wrappers](https://github.com/eyalroz/cuda-api-wrappers) - Lightweight, Modern-C++ wrappers for the CUDA GPU programming runtime API. [BSD]
* [cupla](https://github.com/ComputationalRadiationPhysics/cupla) - C++ API to run CUDA/C++ on OpenMP, Threads, TBB, ... through Alpaka. [LGPLv3+]
* [C++React](https://github.com/schlangster/cpp.react) - A reactive programming library for C++11. [Boost]
* [FiberTaskingLib](https://github.com/RichieSams/FiberTaskingLib) - Task-based multi-threading library that supports task graphs with arbitrary dependencies. [Apache]
* [HPX](https://github.com/STEllAR-GROUP/hpx/) - A general purpose C++ runtime system for parallel and distributed applications of any scale. [Boost]
* [Intel Games Task Scheduler](https://github.com/GameTechDev/GTS-GamesTaskScheduler) - A task scheduling framework designed for the needs of game developers. [MIT]
* [Intel Parallel STL](https://github.com/intel/parallelstl) - Intel® implementation of C++17 STL for C++11 and above. [Apache2]
* [Intel TBB](https://www.threadingbuildingblocks.org/) - Intel® Threading Building Blocks. [Apache2]
* [junction](https://github.com/preshing/junction) - A library of concurrent data structures in C++. [BSD]
* [Kokkos](https://github.com/kokkos/kokkos) - A performance portable programming model for parallel execution and memory abstraction. [BSD]
* [libcds](https://github.com/khizmax/libcds) - A C++ library of Concurrent Data Structures. [BSD]
* [Libclsph](https://github.com/libclsph/libclsph) - An OpenCL based GPU accelerated SPH fluid simulation library. [MIT]
* [libdill](https://github.com/sustrik/libdill/) - Introduces structured concurrency in C. [MIT]
* [libdispatch](https://github.com/apple/swift-corelibs-libdispatch) - Grand Central Dispatch (GCD), developed by Apple Inc., is a task parallelism technology based on the thread pool pattern. libdispatch is a library that provides the implementation of GCD's services. [Apache-2.0] [website](https://apple.github.io/swift-corelibs-libdispatch/)
* [libmill](https://github.com/sustrik/libmill/) - Introduces Go-style concurrency in C. [MIT]
* [marl](https://github.com/google/marl) - Marl is a hybrid thread / fiber task scheduler written in C++ 11. [Apache-2.0]
* [moderngpu](https://github.com/moderngpu/moderngpu) - moderngpu is a productivity library for general-purpose computing on GPUs. It is a header-only C++ library written for CUDA. The unique value of the library is in its accelerated primitives for solving irregularly parallel problems. [FreeBSD & Copyright, Sean Baxter]
* [NCCL](https://github.com/NVIDIA/nccl) - Optimized primitives for collective multi-GPU communication. [BSD]
* [OpenCL](https://www.khronos.org/opencl/) - The open standard for parallel programming of heterogeneous systems.
* [OpenMP](http://openmp.org/) - The OpenMP API.
* [rotor](https://github.com/basiliscos/cpp-rotor) - Event loop friendly C++ actor micro framework. [MIT]
* [SObjectizer](https://github.com/Stiffstream/sobjectizer) - An implementation of Actor, Publish-Subscribe, and CSP models in one rather small C++ framework. [BSD-3-Clause]
* [Quantum](https://github.com/bloomberg/quantum) - A powerful C++ coroutine dispatcher framework built on top of [boost::coroutines2](https://www.boost.org/doc/libs/1_65_0/libs/coroutine2/doc/html/index.html).
* [RaftLib](http://raftlib.io/) - The RaftLib C++ library, streaming/dataflow concurrency via C++ iostream-like operators [Apache2]
* [readerwriterqueue](https://github.com/cameron314/readerwriterqueue) - A fast single-producer, single-consumer lock-free queue for C++. [BSD]
* [stdgpu](https://github.com/stotko/stdgpu) - Efficient STL-like Data Structures on the GPU. [Apache2]
* [Thrust](http://thrust.github.io/) - A parallel algorithms library which resembles the C++ Standard Template Library (STL). [Apache2]
* [transwarp](https://github.com/bloomen/transwarp) - A header-only C++ library for task concurrency. [MIT]
* [VexCL](https://github.com/ddemidov/vexcl) - A C++ vector expression template library for OpenCL/CUDA. [MIT]
* [STAPL](http://parasol-lab.gitlab.io/stapl-home/) - A C++ parallel programming framework designed to work on both shared and distributed memory parallel computers. [BSD]
* [concurrencpp](https://github.com/David-Haim/concurrencpp) - A general concurrency library containing tasks, executors, timers and C++20 coroutines to rule them all.
## Configuration
*Configuration files, INI files*
* [inifile-cpp](https://github.com/Rookfighter/inifile-cpp) - A header-only and easy to use Ini file parser for C++. [MIT]
* [inih](https://github.com/benhoyt/inih) - Simple .INI file parser in C, good for embedded systems. [BSD-3-Clause]
* [inih](https://github.com/jtilly/inih) - Single header only C++ version of [inih](https://github.com/benhoyt/inih). [BSD-3-Clause]
* [iniparser](https://github.com/ndevilla/iniparser) - INI file parser. [MIT]
* [libconfig](https://github.com/hyperrealm/libconfig) - C, C++ library for processing structured configuration files. [LGPL-2.1] [website](https://hyperrealm.github.io/libconfig/)
* [libconfuse](https://github.com/martinh/libconfuse) - Small configuration file parser library for C. [ISC]
* [simpleini](https://github.com/brofield/simpleini) - Cross-platform C++ library providing a simple API to read and write INI-style configuration files. [MIT]
* [toml++](https://github.com/marzer/tomlplusplus) - Header-only TOML parser and serializer for C++17 and later. [MIT] [website](https://marzer.github.io/tomlplusplus/)
## Containers
* [C++ B-tree](https://github.com/algorithm-ninja/cpp-btree) - A template library that implements ordered in-memory containers based on a B-tree data structure. [Apache2]
* [Colony](https://github.com/mattreecebentley/plf_colony) - An unordered "bag"-type container which outperforms std containers in high-modification scenarios while maintaining permanent pointers to non-erased elements regardless of insertion/erasure. [zLib] [website](http://www.plflib.org/colony.htm)
* [dynamic_bitset](https://github.com/pinam45/dynamic_bitset) - A C++17 header-only dynamic bitset. [MIT]
* [Forest](https://github.com/xorz57/forest) - Template library implementing an AVL, a Binary Search, a KD and a Quad Tree. [MIT]
* [Hashmaps](https://github.com/goossaert/hashmap) - Implementation of open addressing hash table algorithms in C++. [MIT]
* [Hopscotch map](https://github.com/Tessil/hopscotch-map) - A fast header-only hash map which uses hopscotch hashing for collisions resolution. [MIT]
* [LSHBOX](https://github.com/RSIA-LIESMARS-WHU/LSHBOX) - A c++ toolbox of locality-sensitive hashing (LSH), provides several popular LSH algorithms, also support Python and MATLAB. [GPL]
* [PGM-index](https://github.com/gvinciguerra/PGM-index) - A data structure that enables fast lookup, predecessor, range searches and updates in arrays of billions of items using orders of magnitude less space than traditional indexes. [Apache2] [website](https://pgm.di.unipi.it)
* [plf::list](https://github.com/mattreecebentley/plf_list) - A std::list implementation which removes range splicing in order to enable cache-friendlier structure, yielding significant performance gains. [zLib] [website](http://www.plflib.org/list.htm)
* [plf::stack](https://github.com/mattreecebentley/plf_stack) - A replacement container for the std::stack container adaptor, with better performance than any std container in a stack context. [zLib] [website](http://www.plflib.org/stack.htm)
* [ring_span lite](https://github.com/martinmoene/ring-span-lite) - A simplified implementation of Arthur O'Dwyer's ring_span implementation ie. a circular buffer view. [MIT]
* [robin-hood-hashing](https://github.com/martinus/robin-hood-hashing) - Fast & memory efficient hashtable based on robin hood hashing for C++14. [MIT]
* [robin-map](https://github.com/Tessil/robin-map) - Fast hash map and hash set using robin hood hashing. [MIT]
* [sparsepp](https://github.com/greg7mdp/sparsepp) - A fast, memory efficient hash map for C++. [BSD 3-clause]
## Cryptography
*Cryptography and Encryption Libraries*
* [Bcrypt](http://bcrypt.sourceforge.net/) - A cross platform file encryption utility. Encrypted files are portable across all supported operating systems and processors. [BSD]
* [BeeCrypt](http://beecrypt.sourceforge.net/) - A portable and fast cryptography library. [LGPLv2.1+]
* [Botan](http://botan.randombit.net/) - A crypto library for C++. [BSD-2]
* [Crypto++](https://github.com/weidai11/cryptopp) - A free C++ class library of cryptographic schemes. [Boost] [website](http://www.cryptopp.com/)
* [digestpp](https://github.com/kerukuro/digestpp) - C++11 header-only message digest (hash) library. [PublicDomain]
* [GnuPG](https://www.gnupg.org/) - A complete and free implementation of the OpenPGP standard. [GPL]
* [GnuTLS](http://www.gnutls.org/) - A secure communications library implementing the SSL, TLS and DTLS protocols. [LGPL2.1]
* [Libgcrypt](http://www.gnu.org/software/libgcrypt/) - A general purpose cryptographic library originally based on code from GnuPG. [LGPLv2.1+]
* [LibreSSL](http://www.libressl.org/) - A free version of the SSL/TLS protocol forked from OpenSSL in 2014. [?]
* [libsodium](https://github.com/jedisct1/libsodium) - P(ortable|ackageable) NaCl-based crypto library, opinionated and easy to use. [ISC]
* [libhydrogen](https://github.com/jedisct1/libhydrogen) - A lightweight, secure, easy-to-use crypto library suitable for constrained environments. [ISC]
* [LibTomCrypt](https://github.com/libtom/libtomcrypt) - A fairly comprehensive, modular and portable cryptographic toolkit. [WTFPL]
* [mbedTLS](https://github.com/ARMmbed/mbedtls) - An open source, portable, easy to use, readable and flexible SSL library, previously known as PolarSSL. [Apache2] [website](https://tls.mbed.org/)
* [Nettle](http://www.lysator.liu.se/~nisse/nettle/) - A low-level cryptographic library. [LGPL]
* [OpenSSL](https://github.com/openssl/openssl) - A robust, commercial-grade, full-featured, and Open Source cryptography library. [Apache] [website](http://www.openssl.org/)
* [retter](https://github.com/MaciejCzyzewski/retter) - A collection of hash functions, ciphers, tools, libraries, and materials related to cryptography.
* [s2n](https://github.com/awslabs/s2n) - An implementation of the TLS/SSL protocols. [Apache]
* [sha1collisiondetection](https://github.com/cr-marcstevens/sha1collisiondetection) - Library and command line tool to detect SHA-1 collision in a file. [MIT]
* [Tink](https://github.com/google/tink) - A multi-language, cross-platform library that provides cryptographic APIs that are secure, easy to use correctly, and hard(er) to misuse. [Apache-2.0]
* [Tiny AES in C](https://github.com/kokke/tiny-AES-c) - Small portable AES128/192/256 in C. [PublicDomain]
* [Themis](https://github.com/cossacklabs/themis) - crypto library for painless data security, providing symmetric and asymmetric encryption, secure sockets with forward secrecy, for mobile and server platforms. [Apache2]
* [HEhub](https://github.com/primihub/HEhub) - A library for homomorphic encryption and its applications. [Apache2]
## CSV
*Libraries for parsing Comma Separated Value (CSV) files*
* [csv2](https://github.com/p-ranav/csv2) - Fast CSV parser for modern C++. [MIT]
* [Csv::Parser](https://github.com/ashaduri/csv-parser) - Compile-time and runtime CSV parser written in C++17. [Zlib]
* [Fast C++ CSV Parser](https://github.com/ben-strasser/fast-cpp-csv-parser) - Small, easy-to-use and fast header-only library for reading CSV files. [BSD-3-Clause]
* [lazycsv](https://github.com/ashtum/lazycsv) - A fast, lightweight and single-header csv parser for modern C++. [MIT]
* [Vince's CSV Parser](https://github.com/vincentlaucsb/csv-parser) - A fast, self-contained, streaming C++17 CSV parser with optional type-casting and statistics. [MIT]
## Database
*Database Libraries, SQL Servers, ODBC Drivers, and Tools*
* [ClickHouse](https://github.com/ClickHouse/clickhouse-cpp) - C++ client for ClickHouse DBMS. [Apache2]
* [hiberlite](https://github.com/paulftw/hiberlite) - C++ Object-relational mapping for sqlite3. [BSD]
* [Hiredis](https://github.com/redis/hiredis) - A minimalistic C client library for the Redis database. [BSD]
* [Kvrocks](https://github.com/apache/incubator-kvrocks) - A distributed key value NoSQL database that uses RocksDB as storage engine and is compatible with Redis protocol. [Apache2]
* [LevelDB](https://github.com/google/leveldb) - A fast key-value storage library written at Google that provides an ordered mapping from string keys to string values. [BSD]
* [libpqxx](https://github.com/jtv/libpqxx) - The official C++ client API for PostgreSQL. [BSD-3-Clause]
* [LMDB](https://www.symas.com/lmdb) - Very fast embedded key/value store with full ACID semantics. [OpenLDAP]
* [LMDB++](https://github.com/bendiken/lmdbxx) - C++11 wrapper for the LMDB embedded database library. [PublicDomain]
* [MongoDB C Driver](https://github.com/mongodb/mongo-c-driver) - MongoDB client library for C. [Apache2]
* [MongoDB C++ Driver](https://github.com/mongodb/mongo-cxx-driver) - C++ driver for MongoDB. [Apache2]
* [MongoDB Libbson](https://github.com/mongodb/libbson) - A BSON utility library. [Apache2]
* [MySQL++](http://www.tangentsoft.net/mysql++/) - A C++ wrapper for MySQL's C API. [LGPL]
* [nanodbc](https://github.com/nanodbc/nanodbc) - A small C++ wrapper for the native C ODBC API. [MIT]
* [ODB](https://www.codesynthesis.com/products/odb/) - An open-source, cross-platform, and cross-database object-relational mapping (ORM) system for C++. [GPLv2]
* [redis3m](https://github.com/luca3m/redis3m) - Wrapper of hiredis with clean C++ interface, supporting sentinel and ready to use patterns. [Apache2]
* [RocksDB](https://github.com/facebook/rocksdb) - Embedded key-value store for fast storage from facebook. [BSD]
* [SimDB](https://github.com/LiveAsynchronousVisualizedArchitecture/simdb) - High performance, shared memory, lock free, cross platform, single file, minimal dependencies, C++11 key-value store [Apache2]
* [SOCI](https://github.com/SOCI/soci) - A database abstraction layer for C++. [BSL-1.0]
* [SQLite](http://www.sqlite.org/) - A completely embedded, full-featured relational database in a few 100k that you can include right into your project. [PublicDomain]
* [SQLiteC++](https://github.com/SRombauts/SQLiteCpp) - SQLiteC++ (SQLiteCpp) is a smart and easy to use C++ SQLite3 wrapper. [MIT]
* [sqlite_modern_cpp](https://github.com/SqliteModernCpp/sqlite_modern_cpp) - Header only C++14 wrapper around sqlite library. [MIT]
* [sqlite_orm](https://github.com/fnc12/sqlite_orm) - SQLite ORM light header only library for modern C++. [AGPL + paid MIT]
* [sqlpp11](https://github.com/rbock/sqlpp11) - A type safe embedded domain specific language for SQL queries and results in C++. [BSD-2-Clause]
* [TileDB](https://github.com/TileDB-Inc/TileDB) - Fast Dense and Sparse Multidimensional Array DBMS. [MIT] [website](https://tiledb.io/)
* [UnQLite](https://github.com/symisc/unqlite) - A self-contained, serverless, zero-configuration, transactional NoSQL engine. [BSD-2-Clause] [website](https://unqlite.org/)
* [upscaledb](https://upscaledb.com) - An embedded "typed" key/value store with a built-in query interface. [GPLv3]
## Data visualization
*Data visiualization Libraries*
* [matplotplusplus](https://github.com/alandefreitas/matplotplusplus) - C++ Graphics Library for Data Visualization. [MIT] [website](https://alandefreitas.github.io/matplotplusplus/)
## Debug
*Debugging Libraries, Memory Leak and Resource Leak Detection, Unit Testing*
* [backward-cpp](https://github.com/bombela/backward-cpp) - A beautiful stack trace pretty printer for C++. [MIT]
* [benchmark](https://github.com/google/benchmark) - Google provided small microbenchmark support library. [Apache2]
* [Boost.Test](http://www.boost.org/doc/libs/master/libs/test/doc/html/index.html) - Boost Test Library. [Boost]
* [check](https://github.com/libcheck/check) - Check is a unit testing framework for C. [LGPL-2.1] [website](https://libcheck.github.io/check/)
* [doctest](https://github.com/onqtam/doctest) - The lightest feature rich C++ single header testing framework. [MIT]
* [Catch2](https://github.com/catchorg/Catch2) - A modern, C++-native, header-only, test framework for unit-tests, TDD and BDD. [BSL-1.0]
* [Celero](https://github.com/DigitalInBlue/Celero) - C++ Benchmarking Framework. [Apache2]
* [CppUTest](https://github.com/cpputest/cpputest) - Unit testing and mocking framework for C/C++. [BSD-3-clause]
* [CUTE](http://cute-test.com) - C++ Unit Testing Easier. [LGPL3]
* [CMocka](https://cmocka.org/) - unit testing framework for C with support for mock objects. [Apache2]
* [CppUnit](http://www.freedesktop.org/wiki/Software/cppunit/) - C++ port of JUnit. [LGPL2]
* [CTest](https://cmake.org/cmake/help/v2.8.8/ctest.html) - The CMake test driver program. [BSD]
* [dbg-macro](https://github.com/sharkdp/dbg-macro) - A dbg(…) macro for C++. [MIT]
* [DebugViewPP](https://github.com/CobaltFusion/DebugViewPP) - Debug logging viewer. [BSL]
* [Deleaker](http://www.deleaker.com) - A tool for resource leak detection, including memory, GDI and handle leaks.
* [FakeIt](https://github.com/eranpeer/FakeIt) - Simple mocking framework for C++. [MIT]
* [fff](https://github.com/meekrosoft/fff) - A micro-framework for creating fake C functions. [MIT]
* [Google Mock](https://github.com/google/googletest/blob/master/googlemock/README.md) - A library for writing and using C++ mock classes. [BSD]
* [Google Test](https://github.com/google/googletest) - Google C++ Testing Framework. [BSD]
* [ig-debugheap](https://github.com/deplinenoise/ig-debugheap) - Multiplatform debug heap useful for tracking down memory errors. [BSD]
* [libtap](https://github.com/zorgnax/libtap) - Write tests in C. [GPL2]
* [microprofile](https://github.com/jonasmr/microprofile) - Profiler with web-view for multiple platforms. [Unlicense]
* [MinUnit](https://github.com/siu/minunit) - A minimal unit testing framework for C self-contained in a single header file. [MIT]
* [Mockator](http://www.mockator.com) - Eclipse CDT plug-in for C++ Seams and Mock Objects.
* [nanobench](https://github.com/martinus/nanobench) - Simple, fast, accurate single-header microbenchmarking functionality for C++11/14/17/20. [MIT] [website](https://nanobench.ankerl.com)
* [Nanotimer](https://github.com/mattreecebentley/plf_nanotimer) - A simple low-overhead cross-platform timer class for benchmarking. [zLib] [website](http://www.plflib.org/nanotimer.htm)
* [Nonius](https://github.com/libnonius/nonius) - A C++ micro-benchmarking framework. [CC]
* [Remotery](https://github.com/Celtoys/Remotery) - Single C File Profiler with Web Viewer. [Apache2]
* [snitch](https://github.com/cschreib/snitch) - Lightweight C++20 testing framework. [Boost]
* [Touca](https://github.com/trytouca/trytouca) - Open-source regression testing system that you can self-host. [Apache2] [website](https://touca.io/)
* [UnitTest++](https://github.com/unittest-cpp/unittest-cpp) - A lightweight unit testing framework for C++. [MIT/X Consortium license]
* [Unity](https://github.com/ThrowTheSwitch/Unity) - Simple Unit Testing for C. [MIT]
* [utest.h](https://github.com/sheredom/utest.h) - Single header unit testing framework for C and C++. [Unlicense]
* [μt](https://github.com/boost-experimental/ut) - C++20 single header/single module, macro-free μ(micro)/Unit Testing Framework [Boost]
* [VLD](https://kinddragon.github.io/vld//) - Visual Leak Detector. A free, robust, open-source memory leak detection system for Visual C++.
## Font
*Libraries for parsing and manipulating font files.*
* [Fontconfig](https://gitlab.freedesktop.org/fontconfig/fontconfig) - Font configuration and customization library. [MIT] [website](https://www.freedesktop.org/wiki/Software/fontconfig/)
* [FreeType](https://www.freetype.org/) - FreeType is a freely available software library to render fonts. [FTL & GPLv2]
* [otfcc](https://github.com/caryll/otfcc) - A C library and utility used for parsing and writing OpenType font files. [Apache-2.0]
* [harfbuzz](https://github.com/harfbuzz/harfbuzz) - A text shaping engine [Old MIT]
## Game Engine
* [Acid](https://github.com/Equilibrium-Games/Acid) - A high speed C++17 Vulkan game engine. [MIT]
* [Allegro](http://liballeg.org/) - A cross-platform library mainly aimed for video games and multimedia programming. [zlib]
* [Cocos2d-x](http://www.cocos2d-x.org/) - A multi-platform framework for building 2d games, interactive books, demos and other graphical applications. [MIT]
* [Corange](https://github.com/orangeduck/Corange) - A game engine written in pure C, SDL and OpenGL. [BSD]
* [crown](https://github.com/dbartolini/crown) - Crown is a general purpose data-driven game engine, written from scratch in orthodox C++ with a minimalistic and data-oriented design philosophy in mind. [MIT]
* [delta3d](http://sourceforge.net/projects/delta3d/) - A robust simulation platform. [LGPL2]
* [EnTT](https://github.com/skypjack/entt) - Gaming meets modern C++. [MIT]
* [GamePlay](https://github.com/gameplay3d/GamePlay) - A cross-platform native C++ game framework for creating 2D/3D mobile and desktop games. [Apache2]
* [Godot](https://github.com/godotengine/godot) - A fully featured, open source, MIT licensed, game engine. [MIT]
* [Grit](https://github.com/grit-engine/grit-engine) - Community project to build a free game engine for implementing open world 3D games. [MIT]
* [Halley](https://github.com/amzeratul/halley) - A lightweight game engine written in C++14 with a "true" entity-component system. [Apache 2.0]
* [KlayGE](https://github.com/gongminmin/KlayGE) - a cross-platform open source game engine with plugin-based architecture. [GPLv2] [website](http://www.klayge.org/)
* [nCine](https://github.com/nCine/nCine) - A cross-platform 2D game engine with an emphasis on performance, written in C++11 and optionally scriptable in Lua. [MIT] [website](https://ncine.github.io/)
* [o3de](https://github.com/o3de/o3de) - An open-source, real-time, multi-platform 3D engine based on Amazon Lumberyard. [Apache2] [website](https://o3de.org/)
* [OpenXRay](https://github.com/OpenXRay/xray-16) - a community-modified X-Ray engine used in S.T.A.L.K.E.R. game series. [Modified BSD/non-commercial only]
* [Oxygine](http://oxygine.org/) - A cross-platform 2D C++ game engine. [MIT]
* [Panda3D](https://github.com/panda3d/panda3d) - A game engine, a framework for 3D rendering and game development for Python and C++ programs. [Modified BSD] [website](https://www.panda3d.org/)
* [PixelGameEngine](https://github.com/OneLoneCoder/olcPixelGameEngine) - The official distribution of olcPixelGameEngine, a tool used in javidx9's YouTube videos and projects. [OLC3]
* [Polycode](https://github.com/ivansafrin/Polycode) - A cross-platform framework for creative code in C++ (with Lua bindings). [MIT] [website](http://polycode.org/)
* [raylib](https://github.com/raysan5/raylib) - A simple and easy-to-use library to enjoy videogames programming. [zlib/libpng] [website](http://www.raylib.com/)
* [Spring](https://github.com/spring/spring) - A powerful free cross-platform RTS game engine. [GPLv2/GPLv3] [website](https://springrts.com/)
* [Torque2D](https://github.com/TorqueGameEngines/Torque2D) - An open-source and cross-platform C++ engine built for 2D game development. [MIT] [website](https://torque3d.org/torque2d)
* [Torque3D](https://github.com/TorqueGameEngines/Torque3D) - An open-source C++ engine built for 3D game development. [MIT] [website](https://torque3d.org/torque3d)
* [toy engine](https://github.com/hugoam/toy) - toy is a thin and modular c++ game engine and offers simple expressive c++ idioms to design full featured 2D or 3D games in fast iterations.
* [Urho3D](https://urho3d.github.io/) - A free lightweight, cross-platform 2D and 3D game engine implemented in C++. Greatly inspired by OGRE and Horde3D. [MIT]
## GUI
*Graphic User Interface*
* [Boden](https://github.com/AshampooSystems/boden) - Native, mobile, cross-platform GUI Framework. [GPL/LGPL/Commercial] [website](https://www.boden.io)
* [CEGUI](http://cegui.org.uk/) - Flexible, cross-platform GUI library.
* [Elements](https://github.com/cycfi/elements) - Lightweight, fine-grained, resolution independent, modular GUI library. [MIT]
* [FLTK](http://www.fltk.org/index.php) - Fast, light, cross-platform C++ GUI toolkit. [GPL2]
* [GacUI](https://github.com/vczh-libraries/GacUI) - GPU Accelerated C++ User Interface, with WYSIWYG developing tools, XML supports, built-in data binding and MVVM features. [Ms-PL]
* [GTK+](http://www.gtk.org/) - A multi-platform toolkit for creating graphical user interfaces. [LGPL]
* [gtkmm](http://www.gtkmm.org/en/) - The official C++ interface for the popular GUI library GTK+. [LGPL]
* [imgui](https://github.com/ocornut/imgui) - Immediate Mode Graphical User Interface with minimal dependencies. [MIT]
* [implot](https://github.com/epezent/implot) - Immediate Mode Plotting widgets for imgui. [MIT]
* [iup](https://www.tecgraf.puc-rio.br/iup) - Multi-platform toolkit for building graphical user interfaces. [MIT]
* [libui](https://github.com/andlabs/libui) - Simple and portable (but not inflexible) GUI library in C that uses the native GUI technologies of each platform it supports. [MIT]
* [MyGUI](https://github.com/MyGUI/mygui) - Fast, flexible and simple GUI. [MIT]
* [nana](http://nanapro.org/en-us/) - Nana is a cross-platform library for GUI programming in modern C++ style. [Boost]
* [NanoGui](https://github.com/mitsuba-renderer/nanogui) - A minimalistic cross-platform widget library for OpenGL 3.x or higher. [BSD]
* [nuklear](https://github.com/Immediate-Mode-UI/Nuklear) - A single-header ANSI C gui library. [PublicDomain]
* [QCustomPlot](http://qcustomplot.com/) - Qt plotting widget without further dependencies. [GPLv3]
* [Qwt](http://qwt.sourceforge.net/) - Qt Widgets for Technical Applications. [Own based on LGPL]
* [QwtPlot3D](http://qwtplot3d.sourceforge.net/) - A feature-rich Qt/OpenGL-based C++ programming library, providing essentially a bunch of 3D-widgets. [zlib]
* [RmlUi](https://github.com/mikke89/RmlUi) - The HTML/CSS User Interface library evolved. Fork of libRocket. [MIT]
* [Sciter](http://sciter.com/) - Sciter is an embeddable HTML/CSS/scripting engine aimed to be used as an UI layer of modern desktop applications. [Free/Commercial]
* [Slint](https://github.com/slint-ui/slint) - Lightweight GUI toolkit for desktop and embedded. [GPL/Free/Commercial] [website](https://slint-ui.com)
* [wxWidgets](http://wxwidgets.org/) - A C++ library that lets developers create applications for Windows, Mac OS X, Linux and other platforms with a single code base. [Own LGPL]
* [xtd](https://github.com/gammasoft71/xtd) - Modern C++17/20 framework to create console (CLI), forms (GUI like WinForms) and tunit (unit tests like Microsoft Unit Testing Framework) applications on Windows, macOS, Linux, iOS and android. [MIT]
* [Yue](https://github.com/yue/yue) - A library for creating native cross-platform GUI apps. [LGPLv2]
## Graphics
* [assimp](https://github.com/assimp/assimp) - Open Asset Import Library (assimp) is a cross-platform 3D model import library which aims to provide a common API for different 3D asset file formats. [BSD-3-Clause] [website](http://www.assimp.org)
* [bgfx](https://github.com/bkaradzic/bgfx) - A cross-platform rendering library. [BSD]
* [Blend2D](https://github.com/blend2d/blend2d) - 2D vector graphics engine powered by a JIT compiler. [Zlib] [website](https://blend2d.com/)
* [bs::framework](https://github.com/GameFoundry/bsf) - Modern C++14 library for the development of real-time graphical applications. [MIT]
* [Cairo](http://www.cairographics.org/) - A 2D graphics library with support for multiple output devices. [LGPL2 or Mozilla MPL]
* [C-Turtle](https://github.com/walkerje/C-Turtle) - A C++11 header-only turtle graphics library acting as a CImg wrapper. [MIT]
* [Diligent Engine](https://github.com/DiligentGraphics/DiligentEngine) - A modern cross-platform low-level 3D graphics library. [Apache2]
* [DirectXTK](https://github.com/Microsoft/DirectXTK) - A collection of helper classes for writing DirectX 11.x code in C++. [MIT]
* [GLFW](https://github.com/glfw/glfw) - A simple, cross-platform OpenGL wrangling library. [zlib/libpng]
* [Harfang 3D](https://github.com/harfang3d/harfang3d) 3D visualization library usable in C++, Python, Lua and Go. Based on BGFX. [GPLv3/LGPLv3/Commercial] [website](https://www.harfang3d.com)
* [herebedragons](https://github.com/kosua20/herebedragons) - A basic 3D scene implemented with various engines, frameworks or APIs. [MIT] [website](http://simonrodriguez.fr/dragon/)
* [Horde3D](https://github.com/horde3d/Horde3D) - A small 3D rendering and animation engine. [EPL]
* [Ion](https://github.com/google/ion) - A small and efficient set of libraries for building cross-platform client or server applications that use 3D graphics. [Apache2] [website](https://google.github.io/ion/)
* [Irrlicht](http://irrlicht.sourceforge.net/) - A high performance realtime 3D engine written in C++. [zlib]
* [libigl](https://github.com/libigl/libigl) - Simple C++ geometry processing library. [MPL2]
* [LLGL](https://github.com/LukasBanana/LLGL) - Low Level Graphics Library (LLGL) is a thin abstraction layer for the modern graphics APIs. [BSD-3-Clause]
* [magnum](https://github.com/mosra/magnum) - Lightweight and modular C++11/C++14 graphics middleware for games and data visualization. [MIT] [website](http://magnum.graphics)
* [NanoVG](https://github.com/memononen/nanovg) - Antialiased 2D vector drawing library on top of OpenGL for UI and visualizations. [Zlib]
* [Ogre 3D](http://www.ogre3d.org/) :zap: - A scene-oriented, real-time, flexible 3D rendering engine (as opposed to a game engine) written in C++. [MIT]
* [OpenSceneGraph](http://www.openscenegraph.org/) - An open source high performance 3D graphics toolkit. [OSGPL]
* [OpenSubdiv](https://github.com/PixarAnimationStudios/OpenSubdiv) - Pixar's library for evaluating and rendering subdivision surfaces on CPU and GPU. [Modified Apache2]
* [OpenVDB](http://www.openvdb.org/) - Library and tools for storing, editing, and rendering volumetric datasets. [MPL2]
* [Panda3D](http://www.panda3d.org/) - A framework for 3D rendering and game development for Python and C++. [BSD]
* [Partio](https://github.com/wdas/partio) - Library for wrangling particle data, with support for most common file formats. [Modified BSD]
* [Skia](https://github.com/google/skia) - A complete 2D graphic library for drawing Text, Geometries, and Images. [BSD] [website](https://skia.org/)
* [TinySpline](https://github.com/msteinbeck/tinyspline) - A small, yet powerful ANSI C library for interpolating, transforming, and querying arbitrary NURBS, B-Splines, and Bézier curves. [MIT]
* [urho3d](https://github.com/urho3d/Urho3D) - Cross-platform rendering and game engine. [Many different, mostly MIT]
* [Yocto/GL](https://github.com/xelatihy/yocto-gl) - Tiny C++ Libraries for Data-Driven Physically-based Graphics. [MIT]
## Image Processing
* [Boost.GIL](http://www.boost.org/doc/libs/1_56_0/libs/gil/doc/index.html) - Generic Image Library.
* [BitmapPlusPLus](https://github.com/baderouaich/BitmapPlusPlus) - Simple and Fast header only Bitmap C++ library. [MIT]
* [CImg](http://cimg.eu/) - A small, open source, C++ toolkit for image processing. [Own LGPL or GPL]
* [CxImage](https://www.codeproject.com/Articles/1300/CxImage) - An image processing and conversion library to load, save, display, transform BMP, JPEG, GIF, PNG, TIFF, MNG, ICO, PCX, TGA, WMF, WBMP, JBG, J2K images. [zlib]
* [Dlib](https://github.com/davisking/dlib) :zap: - A modern C++11 machine learning, computer vision, numerical optimization, and deep learning toolkit. [Boost] [website](http://dlib.net/)
* [FreeImage](http://freeimage.sourceforge.net/) - An open source library that supports popular graphics image formats and others as needed by today's multimedia applications. [GPL2 or GPL3]
* [GD](https://github.com/libgd/libgd) - GD Graphics Library, famously used in PHP for image loading/manipulation & thumbnail generation. [custom permissive license, requires mention in user docs] [website](http://libgd.github.io/)
* [DCMTK](http://dicom.offis.de/dcmtk.php.en) - DICOM Toolkit.
* [GDCM](http://gdcm.sourceforge.net/wiki/index.php/Main_Page) - Grassroots DICOM library.
* [ITK](http://www.itk.org/) - An open-source, cross-platform system for image analysis. [Apache2 from ITK 4.0]
* [Leptonica](https://github.com/DanBloomberg/leptonica) - Leptonica is an open source library containing software that is broadly useful for image processing and image analysis applications. [BSD-2-Clause] [website](http://leptonica.org/index.html)
* [libfacedetection](https://github.com/ShiqiYu/libfacedetection) - Open source library for face detection in images. The face detection speed can reach 1500FPS. [BSD]
* [libjpeg-turbo](https://github.com/libjpeg-turbo/libjpeg-turbo) - A JPEG image codec that uses SIMD instructions to accelerate baseline JPEG encoding and decoding. [IJG & BSD-3-Clause & zlib] [website](https://libjpeg-turbo.org/)
* [libvips](https://github.com/jcupitt/libvips) - A fast image processing library with low memory needs. [LGPL] [website](http://www.vips.ecs.soton.ac.uk/)
* [Magick++](https://imagemagick.org/script/magick++.php) - ImageMagick program interfaces for C++. [Apache2]
* [MagickWnd](https://imagemagick.org/script/magick-wand.php) - ImageMagick program interfaces for C. [Apache2]
* [OpenCV](http://opencv.org/) :zap: - Open source computer vision. [BSD]
* [OpenEXR](http://www.openexr.com/) - Cross-platform library for high dynamic range imaging. [Modified BSDF]
* [OpenImageIO](https://github.com/OpenImageIO/oiio) - Powerful image and texture wrangling library with support for a wide number of common lossy and RAW formats. [Modified BSD]
* [SAIL](https://github.com/happy-sea-fox/sail) - Easy-to-use cross-platform image decoding library with pluggable image codecs. [MIT]
* [Simd](https://github.com/ermig1979/Simd) - C++ image processing library with using of SIMD: SSE, SSE2, SSE3, SSSE3, SSE4.1, SSE4.2, AVX, AVX2, AVX-512, VMX(Altivec) and VSX(Power7), NEON for ARM. [MIT]
* [stb-image](https://github.com/nothings/stb/blob/master/stb_image.h) - STB single-header image loading library. [Public Domain]
* [tesseract-ocr](https://github.com/tesseract-ocr) - An OCR engine. [Apache2]
* [TinyEXIF](https://github.com/cdcseacave/TinyEXIF) - Tiny ISO-compliant C++ EXIF and XMP parsing library for JPEG. [MIT]
* [Video++](https://github.com/matt-42/vpp) - A C++14 high performance video and image processing library. [MIT]
* [VIGRA](https://github.com/ukoethe/vigra) - A generic C++ computer vision library for image analysis. [MIT X11]
* [VTK](http://www.vtk.org/) - Open-source, freely available software system for 3D computer graphics, image processing and visualization. [BSD]
## Internationalization
* [gettext](http://www.gnu.org/software/gettext/) - GNU 'gettext'. [GPL2]
* [IBM ICU](http://site.icu-project.org/) - A set of C/C++ and Java libraries providing Unicode and Globalization support. [ICU]
* [libiconv](http://www.gnu.org/software/libiconv/) - An encoding conversion library between different character encodings. [GPL]
* [utf8.h](https://github.com/sheredom/utf8.h) - Single header utf8 string functions for C and C++. [Unlicense]
* [utf8proc](https://github.com/JuliaStrings/utf8proc) - A clean C library for processing UTF-8 Unicode data. [MIT]
## Inter-process communication
* [Apache Thrift](https://thrift.apache.org/) - Efficient cross-language IPC/RPC, works between C++, Java, Python, PHP, C#, and many more other languages. Originally developed by Facebook. [Apache2]
* [Boost.Interprocess](https://www.boost.org/doc/libs/1_80_0/doc/html/interprocess.html) - Header-only Boost library that supports kernel-level shared memory and memory-mapped files, with in-built synchronization mechanisms (semaphores, mutexes, and more). [Boost] [website](https://www.boost.org/)
* [Cap'n Proto](https://github.com/capnproto/capnproto) - Fast data interchange format and capability-based RPC system. [MIT] [website](https://capnproto.org/)
* [eCAL](https://github.com/continental/ecal) - Pub/sub, client/server, C++/Python/C#, various message protocols (protobuf, capnproto ..). [Apache2] [website](http://www.ecal.io/)
* [gRPC](https://github.com/grpc/grpc) - A high performance, open source, general-purpose RPC framework. [BSD] [website](http://www.grpc.io/)
* [Ice](https://github.com/zeroc-ice/ice) - Comprehensive RPC framework with support for C++, C#, Java, JavaScript, Python and more. [GPLv2]
* [iceoryx](https://github.com/eclipse-iceoryx/iceoryx) - True zero-copy inter-process communication framework for safety critical systems with bindings for C, Rust. Runs on Linux, QNX, Windows, Mac OS, FreeBSD. [Apache2] [website](https://iceoryx.io/)
* [libjson-rpc-cpp](https://github.com/cinemast/libjson-rpc-cpp) - JSON-RPC framework for C++ servers and clients. [MIT]
* [nanomsg](https://github.com/nanomsg/nanomsg) - A simple high-performance implementation of several "scalability protocols". [MIT] [website](http://nanomsg.org/)
* [nng](https://github.com/nanomsg/nng) - nanomsg-next-generation, a light-weight brokerless messaging library. [MIT] [website](https://nanomsg.github.io/nng/)
* [rpclib](https://github.com/rpclib/rpclib) - A modern C++ msgpack-RPC server and client library. [MIT]
* [simple-rpc-cpp](https://github.com/pearu/simple-rpc-cpp) - A simple RPC wrapper generator to C/C++ functions. [BSD]
* [WAMP](http://wamp.ws/) - Provides RPC and pub/sub messaging patterns. (various implementations, various languages)
* [xmlrpc-c](http://xmlrpc-c.sourceforge.net/) - A lightweight RPC library based on XML and HTTP. [BSD]
## JSON
* [Boost.PropertyTree](https://www.boost.org/doc/libs/1_81_0/doc/html/property_tree.html) - A property tree parser/generator that can be used to parse XML/JSON/INI/Info files. [Boost]
* [cJSON](https://github.com/DaveGamble/cJSON) - Ultralightweight JSON parser in ANSI C. [MIT]
* [frozen](https://github.com/cesanta/frozen) - JSON parser and generator for C/C++. [GPL & GPL2]
* [Glaze](https://github.com/stephenberry/glaze) - Extremely fast, in memory, JSON and interface library for modern C++. [MIT]
* [Jansson](https://github.com/akheron/jansson) - C library for encoding, decoding and manipulating JSON data. [MIT]
* [jbson](https://github.com/chrismanning/jbson) - jbson is a library for building & iterating BSON data, and JSON documents in C++14. [Boost]
* [JeayeSON](https://github.com/jeaye/jeayeson) - A very sane (header only) C++ JSON library. [BSD]
* [Jsmn](https://github.com/zserge/jsmn) - A minimalistic JSON parser in C. [MIT]
* [json](https://github.com/nlohmann/json) :zap: - JSON for Modern C++. [MIT]
* [JSON++](https://github.com/hjiang/jsonxx) - A JSON parser in C++. [MIT]
* [json.h](https://github.com/sheredom/json.h) - A simple one header/one source solution to parsing JSON in C and C++. [Unlicense]
* [json-build](https://github.com/lcsmuller/json-build) - C89 tiny zero-allocation JSON serializer. [MIT]
* [json-c](https://github.com/json-c/json-c) - A JSON implementation in C. [MIT]
* [jsoncons](https://github.com/danielaparker/jsoncons) - A C++ header-only library for JSON and JSON-like binary formats with JSONPointer, JSONPatch, JSONPath and JMESPath. [Boost]
* [JsonCpp](https://github.com/open-source-parsers/jsoncpp) - A C++ library for interacting with JSON. [MIT]
* [jsonParse](https://github.com/liufeigit/jsonParse) - A simple JSON parser in ANSI C. [MIT]
* [json-parser](https://github.com/udp/json-parser) - Very low footprint JSON parser written in portable ANSI C. [BSD]
* [json11](https://github.com/dropbox/json11) - A tiny JSON library for C++11. [MIT]
* [json-struct](https://github.com/jorgen/json_struct) - High performance, single header JSON parser parsing to and from C++ structs. [MIT]
* [json-voorhees](https://github.com/tgockel/json-voorhees) - JSON library for C++. Support for C++11. No dependencies, fast and dev-friendly. [Apache2]
* [jute](https://github.com/amir-s/jute) - Very simple C++ JSON Parser. [PublicDomain]
* [libjson](https://github.com/vincenthz/libjson) - A JSON parser and printer library in C. easy to integrate with any model. [LGPL]
* [libjson](http://sourceforge.net/projects/libjson/) - Lightweight JSON library. [?]
* [LIBUCL](https://github.com/vstakhov/libucl) :zap: - Universal configuration library parser [BSD-2-Clause]
* [parson](https://github.com/kgabis/parson) - Parson is a lighweight json library written in C. [MIT]
* [PicoJSON](https://github.com/kazuho/picojson) - A header-file-only, JSON parser serializer in C++. [BSD]
* [qt-json](https://github.com/gaudecker/qt-json) - A simple class for parsing JSON data into a QVariant hierarchy and vice versa. [GPLv3]
* [QJson](https://github.com/flavio/qjson) - A qt-based library that maps JSON data to QVariant objects. [LGPL2]
* [RapidJSON](https://github.com/miloyip/rapidjson) :zap: - A fast JSON parser/generator for C++ with both SAX/DOM style API. [MIT]
* [sajson](https://github.com/chadaustin/sajson) - Lightweight, extremely high-performance JSON parser for C++11. [MIT]
* [simdjson](https://github.com/lemire/simdjson) - Extremely fast JSON library that can parse gigabytes of JSON per second. [Apache-2.0]
* [taoJSON](https://github.com/taocpp/json) - Zero-dependency C++ header-only JSON library. [MIT]
* [ujson](https://bitbucket.org/awangk/ujson) - µjson is a a small, C++11, UTF-8, JSON library. [MIT]
* [YAJL](https://github.com/lloyd/yajl) - A fast streaming JSON parsing library in C. [ISC]
* [yyjson](https://github.com/ibireme/yyjson) - A high performance JSON library written in ANSI C. [MIT]
## Logging
* [Blackhole](https://github.com/3Hren/blackhole) - Attribute-based logging framework, which is designed to be fast, modular and highly customizable. [MIT]
* [Boost.Log](http://www.boost.org/doc/libs/1_56_0/libs/log/doc/html/index.html) - Designed to be very modular and extensible. [Boost]
* [Easylogging++](https://github.com/amrayn/easyloggingpp) - Extremely light-weight high performance logging library for C++11 (or higher) applications. [MIT]
* [fmtlog](https://github.com/MengRao/fmtlog) - A performant fmtlib-style logging library with latency in nanoseconds. [MIT]
* [G3log](https://github.com/KjellKod/g3log) - Asynchronous logger with Dynamic Sinks. [PublicDomain]
* [glog](https://github.com/google/glog) - C++ implementation of the Google logging module.
* [Log4cpp](http://log4cpp.sourceforge.net/) - A library of C++ classes for flexible logging to files, syslog, IDSA and other destinations. [LGPL]
* [log4cplus](https://github.com/log4cplus/log4cplus) - A simple to use C++ logging API providing thread-safe, flexible, and arbitrarily granular control over log management and configuration. [BSD & Apache2]
* [loguru](https://github.com/emilk/loguru) - A lightweight C++ logging library. [PublicDomain]
* [plog](https://github.com/SergiusTheBest/plog) - Portable and simple log for C++ in less than 1000 lines of code. [MPL2]
* [reckless](https://github.com/mattiasflodin/reckless) - Low-latency, high-throughput, asynchronous logging library for C++. [MIT]
* [spdlog](https://github.com/gabime/spdlog) - Super fast, header only, C++ logging library.
* [templog](http://www.templog.org/) - A very small and lightweight C++ library which you can use to add logging to your C++ applications. [Boost]
* [P7Baical](http://baical.net/p7.html) - An open source and cross-platform library for high-speed sending telemetry & trace data with minimal usage of CPU and memory. [LGPL]
* [Quill](https://github.com/odygrd/quill) - Asynchronous cross platform low latency logging library. [MIT]
## Machine Learning
* [Caffe](https://github.com/BVLC/caffe) - A fast framework for neural networks. [BSD]
* [CCV](https://github.com/liuliu/ccv) - C-based/Cached/Core Computer Vision Library, A Modern Computer Vision Library. [BSD]
* [darknet](https://github.com/pjreddie/darknet) - Open source neural network framework written in C and CUDA. [PublicDomain] [website](https://pjreddie.com/darknet/)
* [Dlib](https://github.com/davisking/dlib) :zap: - A modern C++11 machine learning, computer vision, numerical optimization, and deep learning toolkit. [Boost] [website](http://dlib.net/)
* [Fido](https://github.com/FidoProject/Fido) - A highly-modular C++ machine learning library for embedded electronics and robotics. [MIT] [website](http://fidoproject.github.io/)
* [flashlight](https://github.com/facebookresearch/flashlight) - A fast, flexible machine learning library from Facebook AI Research written entirely in C++ and based on the ArrayFire tensor library. [BSD-3-Clause] [website](https://fl.readthedocs.io/en/latest/)
* [libsvm](https://github.com/cjlin1/libsvm) - A simple, easy-to-use, efficient library for Support Vector Machines. [BSD-3-Clause] [website](https://www.csie.ntu.edu.tw/~cjlin/libsvm/)
* [m2cgen](https://github.com/BayesWitnesses/m2cgen) - A CLI tool to transpile trained classic ML models into a native C code with zero dependencies. [MIT]
* [MeTA](https://github.com/meta-toolkit/meta) - A modern C++ data sciences toolkit. [MIT] [website](https://meta-toolkit.org/)
* [Minerva](https://github.com/dmlc/minerva) - A fast and flexible system for deep learning. [Apache2]
* [mlpack](https://github.com/mlpack/mlpack) - A scalable c++ machine learning library. [LGPLv3] [website](http://www.mlpack.org/)
* [OpenCV](https://github.com/Itseez/opencv) :zap: - Open Source Computer Vision Library. [BSD] [website](http://opencv.org/)
* [oneDAL](https://github.com/oneapi-src/oneDAL) - A powerful machine learning library that helps speed up big data analysis. [Apache]
* [ONNX runtime](https://github.com/microsoft/onnxruntime) - C and C++ library for training and inference ONNX models. ONNX is a standard that AI models can be converted into, regardless of the library they are trained with. [MIT] [website](https://onnxruntime.ai/)
* [Recommender](https://github.com/GHamrouni/Recommender) - C library for product recommendations/suggestions using collaborative filtering (CF). [BSD]
* [RNNLIB](https://github.com/szcom/rnnlib) - RNNLIB is a recurrent neural network library for sequence learning problems. [GPLv3]
* [SHOGUN](https://github.com/shogun-toolbox/shogun) - The Shogun Machine Learning Toolbox. [GPLv3]
* [sofia-ml](https://code.google.com/p/sofia-ml/) - The suite of fast incremental algorithms for machine learning. [Apache2]
* [VLFeat](https://github.com/vlfeat/vlfeat) - The VLFeat open source library implements popular computer vision algorithms specialising in image understanding and local featurexs extraction and matching. [BSD-2-Clause] [website](http://www.vlfeat.org/)
* [xgboost](https://github.com/dmlc/xgboost) - Scalable, Portable and Distributed Gradient Boosting (GBDT, GBRT or GBM) Library, for Python, R, Java, Scala, C++ and more. Runs on single machine, Hadoop, Spark, Flink and DataFlow. [Apache2]
* [ncnn](https://github.com/Tencent/ncnn) - A high-performance neural network inference computing framework optimized for mobile platforms. [BSD]
## Math
* [Apophenia](https://github.com/b-k/apophenia) - A C library for statistical and scientific computing [GPL2]
* [Armadillo](https://gitlab.com/conradsnicta/armadillo-code) - Fast C++ library for linear algebra & scientific computing. [Apache2] [website](http://arma.sourceforge.net/)
* [autodiff](https://github.com/autodiff/autodiff) - A modern, fast and expressive C++ library for automatic differentiation. [MIT] [website](https://autodiff.github.io)
* [blaze](https://bitbucket.org/blaze-lib/blaze) - high-performance C++ math library for dense and sparse arithmetic. [BSD]
* [Boost.Multiprecision](http://www.boost.org/doc/libs/master/libs/multiprecision/doc/html/index.html) - provides higher-range/precision integer, rational and floating-point types in C++, header-only or with GMP/MPFR/LibTomMath backends. [Boost]
* [ceres-solver](http://ceres-solver.org/) - C++ library for modeling and solving large complicated nonlinear least squares problems from google. [BSD]
* [CGAL](https://github.com/CGAL/cgal) - Collection of efficient and reliable geometric algorithms. [LGPL&GPL] [website](http://www.cgal.org/)
* [cml](http://cmldev.net/) - free C++ math library for games and graphics. [Boost]
* [CNL](https://github.com/johnmcfarlane/cnl/) - A Compositional Numeric Library for C++. [Boost]
* [CXXGraph](https://github.com/ZigRazor/CXXGraph) - free C++(17) graph header-only library for representation and algorithms execution. [AGPL-3.0]
* [Dlib](https://github.com/davisking/dlib) :zap: - A modern C++11 machine learning, computer vision, numerical optimization, and deep learning toolkit. [Boost] [website](http://dlib.net/)
* [Eigen](http://eigen.tuxfamily.org/) - A high-level C++ library of template headers for linear algebra, matrix and vector operations, numerical solvers and related algorithms. [MPL2]
* [ExprTK](http://www.partow.net/programming/exprtk/) - The C++ Mathematical Expression Toolkit Library (ExprTk) is a simple to use, easy to integrate and extremely efficient run-time mathematical expression parser and evaluation engine. [MIT]
* [Geometric Tools](https://www.geometrictools.com) - C++ library for computing in the fields of mathematics, graphics, image analysis and physics. [Boost] [website](https://www.geometrictools.com)
* [GLM](https://github.com/g-truc/glm) - Header-only C++ math library that matches and inter-operates with OpenGL's GLSL math. [MIT] [website](https://glm.g-truc.net/)
* [GMTL](http://ggt.sourceforge.net/) - Graphics Math Template Library is a collection of tools implementing Graphics primitives in generalized ways. [GPL2]
* [GMP](https://gmplib.org/) - A C library for arbitrary precision arithmetic, operating on signed integers, rational numbers, and floating-point numbers. [LGPL3 & GPL2]
* [Klein](https://github.com/jeremyong/klein) - A fast, SIMD-optimized C++17 Geometric Algebra library for point, line, and plane projections, intersections, joins, rigid-body motion, and more. [MIT] [website](https://jeremyong.com/klein)
* [linalg.h](https://github.com/sgorsten/linalg) - Single header, public domain, short vector math library for C++. [Unlicense]
* [MatX](https://github.com/NVIDIA/MatX) - A GPU-accelerated C++17 numerical computing library with a MATLAB/Python-like syntax [BSD 3-clause]
* [MIRACL](https://github.com/CertiVox/MIRACL) - A Multiprecision Integer and Rational Arithmetic Cryptographic Library. [AGPL]
* [NumCpp](https://github.com/dpilger26/NumCpp) - A templatized header only C++ implementation of the Python Numpy library. [MIT]
* [muparser](https://beltoforion.de/en/muparser) - muParser is an extensible high performance math expression parser library written in C++. [MIT]
* [LibTomMath](https://github.com/libtom/libtommath) - A free open source portable number theoretic multiple-precision integer library written entirely in C. [PublicDomain & WTFPL] [website](http://www.libtom.net/)
* [linmath.h](https://github.com/datenwolf/linmath.h) - A lean linear math library, aimed at graphics programming. [WTFPL]
* [lp_solve](https://sourceforge.net/projects/lpsolve) - A library used to formulate and solve linear programming problems. [LGPL] [website](http://lpsolve.sourceforge.net)
* [OpenBLAS](https://github.com/xianyi/OpenBLAS) - An optimized BLAS library based on GotoBLAS2 1.13 BSD version. [BSD 3-clause] [website](http://www.openblas.net/)
* [PCG-rand](https://www.pcg-random.org/) - PCG is a family of simple fast space-efficient statistically good algorithms for random number generation. Unlike many general-purpose RNGs, they are also hard to predict. [Apache]
* [QuantLib](https://github.com/lballabio/quantlib) - A free/open-source library for quantitative finance. [Modified BSD] [website](http://quantlib.org/)
* [StatsLib](https://github.com/kthohr/stats) - A C++ header-only library of statistical distribution functions. [Apache2] [website](https://www.kthohr.com/statslib.html)
* [SymEngine](https://github.com/symengine/symengine) - Fast symbolic manipulation library, a rewriting of SymPy's core in C++. [MIT]
* [TinyExpr](https://github.com/codeplea/tinyexpr) - A C library for parsing and evaluating math expressions from strings. [zlib]
* [Vc](https://github.com/VcDevel/Vc) - SIMD Vector Classes for C++. [BSD]
* [Versor](http://versor.mat.ucsb.edu/) - A (fast) Generic C++ library for Geometric Algebras, including Euclidean, Projective, Conformal, Spacetime (etc).
* [Wykobi](http://www.wykobi.com/) - A C++ library of efficient, robust and simple to use C++ 2D/3D oriented computational geometry routines. [MIT]
* [xtensor](https://github.com/xtensor-stack/xtensor) - A C++14 library for numerical analysis with multi-dimensional array expressions, inspired by NumPy syntax. [BSD 3-clause] [website](https://xtensor-stack.github.io/xtensor)
* [universal](https://github.com/stillwater-sc/universal) - A C++14 header-only library implementing arbitrary posit arithmetic. The posit number system is a tapered floating point that is more efficient than IEEE floating point. Posits enable reproducible computational science. [MIT license]
## Memory Allocation
* [Boehm GC](https://github.com/ivmai/bdwgc) - Conservative garbage collector for C and C++. [similar to X11] [website](http://www.hboehm.info/gc/)
* [C Smart Pointers](https://github.com/Snaipe/libcsptr) - Smart pointers for the (GNU) C programming language. [MIT]
* [Hoard](https://github.com/emeryberger/Hoard) - Fast, Scalable, and Memory-efficient Malloc for Linux, Windows, and Mac. [GPL, commercial] [website](http://hoard.org/)
* [jemalloc](https://github.com/jemalloc/jemalloc) - General purpose malloc(3) implementation that emphasizes fragmentation avoidance and scalable concurrency support. [BSD] [website](http://jemalloc.net/)
* [memory](https://github.com/foonathan/memory) - STL compatible C++ memory allocator library. [ZLib]
* [memory-allocators](https://github.com/mtrebi/memory-allocators) - Custom memory allocators to improve the performance of dynamic memory allocation. [MIT]
* [mimalloc](https://github.com/microsoft/mimalloc) - A compact general purpose allocator with excellent performance. [MIT]
* [rpmalloc](https://github.com/mjansson/rpmalloc) - Cross platform lock free thread caching 16-byte aligned memory allocator implemented in C. [PublicDomain]
* [snmalloc](https://github.com/microsoft/snmalloc) - Message passing based high-performance allocator. [MIT]
* [TCMalloc](https://github.com/google/tcmalloc) - Google's fast, multi-threaded malloc implementation. [Apache-2.0] [website](https://google.github.io/tcmalloc/)
* [tgc](https://github.com/orangeduck/tgc) - A tiny garbage collector for C written in \~500 LOC. [BSD]
## Multimedia
* [GStreamer](http://gstreamer.freedesktop.org/) - A library for constructing graphs of media-handling components. [LGPL]
* [libass](https://github.com/libass/libass) - Portable subtitle renderer for the ASS/SSA subtitle format. [ISC]
* [libav](https://github.com/libav/libav) - A collection of libraries and tools to process multimedia content such as audio, video, subtitles and related metadata. [LGPL v2.1+ and others] [website](https://www.libav.org/)
* [LIVE555 Streaming Media](http://www.live555.com/liveMedia/) - Multimedia streaming library using open standard protocols (RTP/RTCP, RTSP, SIP). [LGPL]
* [libVLC](https://wiki.videolan.org/LibVLC) - libVLC (VLC SDK) media framework. [GPL]
* [MediaInfoLib](https://github.com/MediaArea/MediaInfoLib) - Convenient unified display of the most relevant technical and tag data for video and audio files. [BSD]
* [QtAv](https://github.com/wang-bin/QtAV) - A multimedia playback framework based on Qt and FFmpeg to write a player easily. [LGPL] [website](http://wang-bin.github.io/QtAV/)
* [SDL](http://www.libsdl.org/) :zap: - Simple DirectMedia Layer. [zlib]
* [SFML](https://github.com/SFML/SFML) :zap: - Simple and Fast Multimedia Library. [zlib] [website](http://www.sfml-dev.org/)
* [TagLib](https://github.com/taglib/taglib) - A library for reading and editing the metadata of several popular audio formats. [LGPL/MPL] [website](https://taglib.org/)
## Networking
* [ACE](http://www.dre.vanderbilt.edu/~schmidt/ACE.html) - An OO Network Programming Toolkit in C++. [?MIT?]
* [Boost.Asio](http://think-async.com/) :zap: - A cross-platform C++ library for network and low-level I/O programming. [Boost]
* [Boost.Beast](https://github.com/boostorg/beast) :zap: - HTTP and WebSocket built on Boost.Asio in C++11. [BSL-1.0] [website](https://www.boost.org/libs/beast)
* [Breep](https://github.com/Organic-Code/Breep) - Event based, high-level C++14 peer-to-peer library. [EUPL-1.1 (OSI approved)]
* [C++ REST SDK](https://github.com/Microsoft/cpprestsdk) - C++ REST SDK (previously named Casablanca). [Apache2]
* [Restbed](https://github.com/corvusoft/restbed) - C++11 Asynchronous RESTful framework. [AGPL]
* [Restinio](https://github.com/Stiffstream/restinio) - A header-only C++14 library that gives you an embedded HTTP/Websocket server. [BSD]
* [c-ares](https://github.com/c-ares/c-ares) - A C library for asynchronous DNS requests. [MIT]
* [cpp-httplib](https://github.com/yhirose/cpp-httplib) - A single file C++11 header-only HTTP/HTTPS server library. [MIT]
* [cpp-netlib](http://cpp-netlib.org/) - A collection of open-source libraries for high level network programming. [Boost]
* [cpp-netlib/uri](https://github.com/cpp-netlib/uri) - URI parser/builder library for C++, compatible with RFC 3986 and RFC 3987. [BSL-1.0]
* [CppServer](https://github.com/chronoxor/CppServer) - Ultra fast and low latency asynchronous socket server & client C++ library with support TCP, SSL, UDP, HTTP, HTTPS, WebSocket protocols and 10K connections problem solution. [MIT]
* [cpr](https://github.com/whoshuu/cpr) - A modern C++ HTTP requests library with a simple but powerful interface. Modeled after the Python Requests module. [MIT] [website](https://docs.libcpr.org)
* [curlcpp](https://github.com/JosephP91/curlcpp) - An object oriented C++ wrapper for CURL(libcurl). [MIT]
* [DPDK](https://github.com/DPDK/dpdk) - Data Plane Development Kit, libraries and drivers for fast packet processing. [BSD-3-Clause & GPL-2.0] [website](https://www.dpdk.org/)
* [Dyad.c](https://github.com/rxi/dyad) - Asynchronous networking for C. [MIT]
* [ENet](https://github.com/lsalzman/enet) - Reliable UDP networking library. [MIT] [website](http://enet.bespin.org/)
* [evpp](https://github.com/Qihoo360/evpp) - C++ high performance networking with TCP/UDP/HTTP protocols. [BSD]
* [H2O](https://github.com/h2o/h2o) - An optimized HTTP server with support for HTTP/1.x and HTTP/2. It can also be used as a library. [MIT]
* [HTTP Parser](https://github.com/nodejs/http-parser) :zap: - A http request/response parser for C. [MIT]
* [KCP](https://github.com/skywind3000/kcp/blob/master/README.en.md) - A fast and reliable ARQ protocol that helps applications to reduce network latency. [MIT]
* [libcurl](http://curl.haxx.se/libcurl/) - Multiprotocol file transfer library. [MIT/X derivate license]
* [libhttpserver](https://github.com/etr/libhttpserver) - C++ library for creating an embedded Rest HTTP server (and more). [LGPL2.1]
* [Libmicrohttpd](http://www.gnu.org/software/libmicrohttpd/) - GNU libmicrohttpd is a small C library that is supposed to make it easy to run an HTTP server as part of another application. [LGPL v2.1+]
* [libpcap](https://github.com/the-tcpdump-group/libpcap) - A portable C/C++ library for network traffic capture. [BSD] [website](https://www.tcpdump.org/)
* [libquic](https://github.com/devsisters/libquic) - A QUIC protocol library extracted from Chromium's QUIC Implementation. [BSD]
* [librdkafka](https://github.com/edenhill/librdkafka) - Apache Kafka client library for C and C++. [BSD-2-Clause]
* [libwebsockets](https://github.com/warmcat/libwebsockets) - A lightweight pure C WebSocket implementation that provides both client and server libraries. [LGPL2.1 + static link exception] [website](https://libwebsockets.org/)
* [Lithium](https://matt-42.github.io/lithium/) - Build high performance C++ HTTP servers without being a C++ expert. [MIT]
* [lwIP](http://savannah.nongnu.org/projects/lwip/) - A lightweight TCP/IP stack. [Modified BSD]
* [Mongoose](https://github.com/cesanta/mongoose) - Extremely lightweight webserver. [GPL2]
* [MQTT-C](https://github.com/LiamBindle/MQTT-C) - A portable MQTT C client for embedded systems and PCs alike. [MIT] [website](https://liambindle.ca/MQTT-C)
* [mTCP](https://github.com/mtcp-stack/mtcp) - Highly scalable user-level TCP stack for multicore systems. [Modified BSD]
* [Muduo](https://github.com/chenshuo/muduo) - A C++ non-blocking network library for multi-threaded server in Linux. [BSD]
* [nghttp2](https://github.com/nghttp2/nghttp2) - HTTP/2 C Library. [MIT] [website](https://nghttp2.org/)
* [Onion](https://github.com/davidmoreno/onion) - HTTP server library in C designed to be lightweight and easy to use. [Apache2/GPL2]
* [PF_RING™](https://github.com/ntop/PF_RING) - High-speed packet processing framework. [LGPL-2.1] [website](https://www.ntop.org/products/packet-capture/pf_ring/)
* [PicoHTTPParser](https://github.com/h2o/picohttpparser) - A tiny, primitive, fast HTTP request/response parser. [MIT]
* [POCO](https://github.com/pocoproject) :zap: - C++ class libraries and frameworks for building network- and internet-based applications that run on desktop, server, mobile and embedded systems. [Boost] [website](http://pocoproject.org/)
* [Proxygen](https://github.com/facebook/proxygen) - Facebook's collection of C++ HTTP libraries including an easy to use HTTP server. [BSD]
* [RakNet](https://github.com/OculusVR/RakNet) - A cross platform, open source, C++ networking engine for game programmers. [BSD]
* [restclient-cpp](https://github.com/mrtazz/restclient-cpp) - Simple REST client for C++. It wraps libcurl for HTTP requests. [MIT]
* [Seasocks](https://github.com/mattgodbolt/seasocks) - Simple, small, C++ embeddable webserver with WebSockets support. [BSD]
* [tlse](https://github.com/eduardsui/tlse) - Single C file TLS 1.2/1.3 implementation, using tomcrypt as crypto library [BSD-2-Clause]
* [Tufão](https://github.com/vinipsmaker/tufao) - An asynchronous web framework for C++ built on top of Qt. [LGPL2]
* [uriparser](https://github.com/uriparser/uriparser) - Strictly RFC 3986 compliant URI parsing and handling library. [BSD-3-Clause]
* [uWebSockets](https://github.com/uNetworking/uWebSockets) - µWS is one of the most lightweight, efficient & scalable WebSocket & HTTP server implementations available. [Zlib]
* [WAFer](https://github.com/riolet/WAFer) - A C language-based ultra-light software platform for scalable server-side and networking applications. Think node.js for C programmers. [GPL2]
* [Wangle](https://github.com/facebook/wangle) - A client/server application framework to build asynchronous, event-driven modern C++ services. [Apache-2.0]
* [wdt](https://github.com/facebook/wdt) - An embeddedable library (and command line tool) aiming to transfer data between 2 systems as fast as possible over multiple TCP paths. [BSD-3-Clause]
* [WebSocket++](https://github.com/zaphoyd/websocketpp) - C++/Boost Asio based websocket client/server library. [BSD]
* [PcapPlusPlus](https://github.com/seladb/PcapPlusPlus) - a multiplatform C++ network sniffing and packet parsing and crafting framework. [Unlicense]
* [ZeroMQ](https://github.com/zeromq/libzmq) - High-speed, modular asynchronous communication library. [LGPL] [website](http://zeromq.org/)
## PDF
*Libraries for parsing and manipulating PDF documents.*
* [libharu](https://github.com/libharu/libharu) - A free, cross platform, open-sourced software library for generating PDF. [zlib]
* [litePDF](https://litepdf.sourceforge.io) - Library to create and edit PDF documents that uses GDI functions through a device context to draw the page content. [LGPL v3 and zlib]
* [MuPDF](https://mupdf.com/) - A lightweight PDF, XPS, and E-book viewer. [AGPL/Commercial]
* [PoDoFo](http://podofo.sourceforge.net/) - A library to work with the PDF file format. [LGPL]
* [Poppler](https://poppler.freedesktop.org/) - Open-source multi-backend PDF rendering library based on the xpdf-3.0 code base. [GPLv2/GPLv3]
* [Xpdf](https://www.xpdfreader.com/) - Xpdf is a free PDF viewer and toolkit, including a text extractor, image converter, HTML converter, and more. [GPL v2/GPL v3]
* [DynaPDF](http://www.dynaforms.com/) - An easy-to-use PDF generation library. [Commercial]
## Physics
*Dynamics simulation engines*
* [Box2D](https://github.com/erincatto/Box2D) - A 2D physics engine for games. [BSD-like]
* [Bullet](https://github.com/bulletphysics/bullet3) - A 3D physics engine for games. [zlib] [website](http://bulletphysics.org)
* [Chipmunk](https://github.com/slembcke/Chipmunk2D) - A fast and lightweight 2D game physics library. [MIT] [website](https://chipmunk-physics.net/)
* [LiquidFun](https://github.com/google/liquidfun) - A 2D physics engine for games. [BSD-like]
* [Newton Dynamics](https://github.com/MADEAPPS/newton-dynamics) - An integrated solution for real time simulation of physics environments. [zlib]
* [ODE](http://www.ode.org/) - Open Dynamics Engine - An open source, high performance library for simulating rigid body dynamics. [BSD&LGPL]
* [Kratos](https://github.com/KratosMultiphysics/Kratos) - framework for building parallel, multi-disciplinary simulation software, aiming at modularity, extensibility, and high performance. [BSD] [website](http://www.cimne.com/kratos/)
* [ofxBox2d](https://github.com/vanderlin/ofxBox2d) - openFrameworks wrapper for Box2D. [BSD-like]
* [PhysX](https://github.com/NVIDIAGameWorks/PhysX-3.4) - An open-source realtime physics engine middleware SDK developed by Nvidia as a part of Nvidia GameWorks software suite. [BSD-3-Clause]
* [Project Chrono](https://github.com/projectchrono/chrono) - An open source multi-physics simulation engine. [BSD-3-Clause] [website](https://projectchrono.org/)
* [Quantum++](https://github.com/vsoftco/qpp) - A modern C++11 quantum computing library. [MIT]
* [Simbody](https://github.com/simbody/simbody) - High-performance C++ multibody dynamics/physics library for simulating articulated biomechanical and mechanical systems like vehicles, robots, and the human skeleton. [Apache2]
* [SOFA](https://github.com/sofa-framework/sofa) - SOFA is an open-source framework targeting at real-time simulation, with an emphasis on medical simulation. [LGPL] [website](https://www.sofa-framework.org)
## Reflection
* [config-loader](https://github.com/netcan/config-loader) - A C++17 static reflection framework, from parse configuration file to native data structure. [MIT]
* [Better Enums](https://github.com/aantron/better-enums) - Reflective enums (to string, iteration). Single header. [BSD] [website](http://aantron.github.io/better-enums/)
* [clReflect](https://github.com/Celtoys/clReflect) - C++ Reflection using clang. [MIT]
* [CPFG](https://github.com/cpgf/cpgf) - A C++03 library for reflection, callback and script binding. [Apache2] [website](http://www.cpgf.org/)
* [CPP-Reflection](https://github.com/AustinBrunkhorst/CPP-Reflection) - C++ Reflection using clang. [MIT]
* [Easy Reflection](https://github.com/chocolacula/easy_reflection_cpp) - Easy and fast reflection + serialization solution like in Rust, Java or Go. [Apache]
* [Magic Enum](https://github.com/Neargye/magic_enum) - Header-only C++17 library provides static reflection for enums (to string, from string, iteration), work with any enum type without any macro or boilerplate code. [MIT]
* [magic_get](https://github.com/apolukhin/magic_get) - std::tuple like methods for user defined types without any macro or boilerplate code. [Boost]
* [meta](https://github.com/skypjack/meta) - Header-only, non-intrusive and macro-free runtime reflection system in C++. [MIT]
* [Nameof](https://github.com/Neargye/nameof) - Header-only C++17 library provides nameof macros and functions to obtain the simple name of variable, type, function, macro, and enum. [MIT]
* [Ponder](https://github.com/billyquith/ponder) - A C++11 library for reflection. [MIT]
* [RTTR](https://github.com/rttrorg/rttr) - A C++11 library for reflection. [MIT] [website](http://www.rttr.org)
* [visit_struct](https://github.com/cbeck88/visit_struct) - A miniature library for struct-field reflection in C++. [BSL-1.0]
* [Refureku](https://github.com/jsoysouvanh/Refureku) - A C++17 runtime reflection and code generation library. [MIT]
## Regular Expression
* [CppVerbalExpressions](https://github.com/VerbalExpressions/CppVerbalExpressions) - C++ regular expressions made easy. [MIT]
* [CTRE](https://github.com/hanickadot/compile-time-regular-expressions) - A Compile time PCRE (almost) compatible regular expression matcher. [MIT]
* [Hyperscan](https://github.com/intel/hyperscan) - Hyperscan is a high-performance multiple regex matching library by Intel. Provides simultaneous matching of large numbers of regexps (up to tens of thousands). Typically used in a DPI library stack. [BSD]
* [Oniguruma](https://github.com/kkos/oniguruma) - A modern and flexible regular expressions library that supports a variety of character encodings. [BSD]
* [PCRE](http://pcre.org/) - A regular expression C library inspired by the regular expression capabilities in Perl. [BSD]
* [PIRE](https://github.com/yandex/pire) - Perl Incompatible Regular Expressions library by Yandex. Can be really fast (more than 400 MB/s). [LPGL v3.0]
* [RE2](https://github.com/google/re2) - A software library for regular expressions via a finite-state machine using automata theory. [BSD-3-Clause]
* [SLRE](https://github.com/cesanta/slre) - Super Light Regexp engine for C/C++. [GPLv2/Commercial]
* [sregex](https://github.com/openresty/sregex) - A non-backtracking NFA/DFA-based Perl-compatible regex engine library for matching on large data streams. [BSD]
## Robotics
* [MOOS-IvP](http://moos-ivp.org) - A set of open source C++ modules for providing autonomy on robotic platforms, in particular autonomous marine vehicles.
* [MRPT](http://www.mrpt.org/) - Mobile Robot Programming Toolkit. [BSD]
* [PCL](https://github.com/PointCloudLibrary/pcl) - Point Cloud Library is a standalone, large scale, open project for 2D/3D image and point cloud processing [BSD] [website](http://www.pointclouds.org/)
* [Robotics Library (RL)](http://www.roboticslibrary.org/) - A self-contained C++ library for robot kinematics, motion planning and control. [BSD]
* [RobWork](https://gitlab.com/sdurobotics/RobWork) - A collection of C++ libraries for simulation and control of robot systems. [Apache2] [website](http://www.robwork.dk/)
* [ROS](http://wiki.ros.org/) - Robot Operating System provides libraries and tools to help software developers create robot applications. [BSD]
* [YARP (Yet Another Robot Platform)](https://github.com/robotology/yarp) - Library and toolkit for communication and device interfaces. [BSD-3-Clause] [website](http://www.yarp.it/)
## Scientific Computing
* [AMGCL](https://github.com/ddemidov/amgcl) - a header-only C++ library for solving large sparse linear systems with algebraic multigrid. [MIT]
* [FFTW](http://www.fftw.org/) - A C library for computing the DFT in one or more dimensions. [GPL]
* [GSL](http://www.gnu.org/software/gsl/) - GNU scientific library. [GPL]
* [preCICE](https://github.com/precice/precice) - Coupling library for partitioned multi-physics simulations (FSI, CHT, and more). [LGPL] [website](https://precice.org/)
* [TileDB](https://github.com/TileDB-Inc/TileDB) - Fast Dense and Sparse Multidimensional Array DBMS. [MIT] [website](https://tiledb.io/)
* [Trilinos](https://github.com/trilinos/Trilinos) - High performance PDE solvers. [BSD]
* [Torch](https://github.com/torch/torch7) - A scientific computing framework with wide support for machine learning algorithms that puts GPUs first. [BSD-3-Clause] [website](http://torch.ch/)
## Scripting
* [AngelScript](https://www.angelcode.com/angelscript/) - AngelScript is a game-oriented interpreted/compiled scripting language. [zlib]
* [Boost.Python](http://www.boost.org/doc/libs/1_65_1/libs/python/doc/html/index.html) - A C++ library which enables seamless interoperability between C++ and the Python programming language. [Boost]
* [cppimport](https://github.com/tbenthompson/cppimport) - Import C++ files directly from Python! [MIT]
* [CppSharp](https://github.com/mono/CppSharp) - Tools and libraries to glue C/C++ APIs to high-level languages. [MIT]
* [ChaiScript](https://github.com/ChaiScript/ChaiScript/) - An easy to use embedded scripting language for C++. [BSD] [website](http://chaiscript.com/)
* [ctypes.sh](https://github.com/taviso/ctypes.sh) - A foreign function interface for bash. [MIT]
* [Cython](https://github.com/cython/cython) - Cython is an optimising static compiler for both the Python programming language and the extended Cython programming language (based on Pyrex). It makes writing C extensions for Python as easy as Python itself. [Apache] [website](http://cython.org/)
* [djinni](https://djinni.xlcpp.dev) - A tool for generating cross-language type declarations and interface bindings. [Apache2]
* [Duktape](https://github.com/svaarala/duktape) - An embeddable Javascript engine with compact footprint. [MIT] [website](http://duktape.org)
* [JavaCpp](https://github.com/bytedeco/javacpp) - The missing bridge between Java and native C++. [Apache2]
* [libffi](https://github.com/libffi/libffi) - A portable foreign-function interface library. [MIT] [website](https://sourceware.org/libffi/)
* [Lua](http://www.lua.org/) - A minimal and fast scripting engine for configuration files and basic application scripting. [MIT]
* [LuaBridge](https://github.com/vinniefalco/LuaBridge) - A lightweight, dependency-free library for binding Lua to C++. [MIT]
* [luacxx](https://github.com/dafrito/luacxx) - C++11 API for creating Lua bindings. [MIT]
* [nbind](https://github.com/charto/nbind) - Magical headers that make your C++ library accessible from JavaScript. [MIT]
* [PHP-CPP](https://github.com/CopernicaMarketingSoftware/PHP-CPP) - A library to build PHP extensions with C++. [Apache2] [website](http://www.php-cpp.com/)
* [pybind11](https://github.com/pybind/pybind11) - Seamless operability between C++11 and Python. [BSD]
* [SIP](https://riverbankcomputing.com/software/sip/intro) - C or C++ Bindings Generator for Python v2 and v3. [GPL]
* [sol2](https://github.com/ThePhD/sol2) - A C++ <-> Lua API wrapper with advanced features and top notch performance. [MIT]
* [SWIG](https://github.com/swig/swig) - A wrapper/interface Generator that let you link your c++ code to Javascript, Perl, PHP, Python, Tcl and Ruby. [GPL/Output not licensed] [website](http://www.swig.org/)
* [V7](https://github.com/cesanta/v7) - An embedded JavaScript engine. [GPL2]
* [V8](https://v8.dev) - A fast JavaScript engine by Google that can be embedded into any C++ application. [BSD]
* [ChakraCore](https://github.com/Microsoft/ChakraCore) -A JavaScript engine by Microsoft that can be embedded into nodejs. [MIT]
## Serialization
* [Bitsery](https://github.com/fraillt/bitsery) - Header only C++ binary serialization library. [MIT]
* [Bond](https://github.com/Microsoft/bond) - An open source, cross-platform framework for working with schematized data. [MIT]
* [Boost.Serialization](https://www.boost.org/doc/libs/master/libs/serialization/doc/index.html) - Boost Serialization Library. [Boost]
* [Cap'n Proto](https://github.com/capnproto/capnproto) - Fast data interchange format and capability-based RPC system. [MIT] [website](https://capnproto.org/)
* [cereal](https://github.com/USCiLab/cereal) - A C++11 library for serialization. [BSD]
* [cista](https://github.com/felixguendling/cista) - A C++17 library for zero-copy high-performance (de-)serialization. [MIT]
* [cppcodec](https://github.com/tplgy/cppcodec) - Header-only C++11 library to encode/decode base64, base32 and hex with consistent, flexible API. [MIT]
* [FastBinaryEncoding](https://github.com/chronoxor/FastBinaryEncoding) - Fast Binary Encoding is ultra fast and universal serialization solution for C++, C#, Go, Java, JavaScript, Kotlin, Python, Ruby, Swift. [MIT]
* [FlatBuffers](https://github.com/google/flatbuffers) - A Memory efficient serialization library. [Apache2]
* [MessagePack](https://github.com/msgpack/msgpack-c) - Efficient binary serialization format "like JSON" for C and C++. [Apache2] [website](http://msgpack.org/)
* [mrpt-serialization](https://github.com/mrpt/mrpt/) - Versioned serialization to binary or text formats. [BSD] [website](https://docs.mrpt.org/reference/latest/group_mrpt_serialization_grp.html)
* [nanopb](https://github.com/nanopb/nanopb) - Small code-size Protocol Buffers implementation in ANSI C. [Zlib]
* [protobuf](https://github.com/protocolbuffers/protobuf) - Protocol Buffers - Google's data interchange format. [BSD]
* [protobuf-c](https://github.com/protobuf-c/protobuf-c) - Protocol Buffers implementation in C. [BSD]
* [SimpleBinaryEncoding](https://github.com/real-logic/simple-binary-encoding) - encoding and decoding application messages in binary format for low-latency applications. [Apache2]
* [upb](https://github.com/protocolbuffers/upb) - A small protobuf implementation in C. [BSD]
* [YAS](https://github.com/niXman/yas) - Very fast **Y**et **A**nother **S**erialization library supports the binary/text/json formats. [Boost]
* [zpp_bits](https://github.com/eyalz800/zpp_bits) - Actually, the fastest modern **S**erialization library. Just check [this video](https://www.youtube.com/watch?v=G7-GQhCw8eE&ab_channel=CppCon).
## Sorting
* [pdqsort](https://github.com/orlp/pdqsort) - Pattern-defeating quicksort. [zlib]
* [Timsort](https://github.com/gfx/cpp-TimSort) - A templated stable sorting function which outperforms quicksort-based algorithms including std::sort, for reversed or semi-sorted data. [MIT]
* [Indiesort](https://github.com/mattreecebentley/plf_indiesort) - A sort wrapper which enables the use of std::sort (& other random-access sort functions) with non-random-access containers, and also improves sort performance for large/non-trivially-copyable types in random-access containers and arrays. [zLib] [website](https://plflib.org/indiesort.htm)
## Video
* [libvpx](http://www.webmproject.org/code/) - VP8/VP9 Codec SDK. [BSD]
* [FFmpeg](https://www.ffmpeg.org/) - A complete, cross-platform solution to record, convert and stream audio and video. [LGPL2/GPL2]
* [libde265](https://github.com/strukturag/libde265) - Open h.265 video codec implementation. [LGPL] [website](http://www.libde265.org/)
* [x265](https://bitbucket.org/multicoreware/x265_git/src) - Open h.265 video codec implementation. [GPL2] [website](https://x265.readthedocs.io/en/master/)
* [OpenH264](https://github.com/cisco/openh264) - Open Source H.264 Codec. [BSD] [website](http://www.openh264.org/)
* [Theora](http://www.theora.org/) - A free and open video compression format. [BSD]
* [Vireo](https://github.com/twitter/vireo/) - A lightweight and versatile video processing library by Twitter. [MIT]
## Virtual Machines
* [CarpVM](https://github.com/tekknolagi/carp) - "interesting" VM in C. Let's see how this goes. [GPLv3]
* [MicroPython](https://github.com/micropython/micropython) - Aims to put an implementation of Python 3.x on a microcontroller. [MIT]
* [TinyVM](https://github.com/jakogut/tinyvm) - A small, fast, lightweight virtual machine written in pure ANSI C. [MIT]
## Web Application Framework
* [Civetweb](https://github.com/civetweb/civetweb) - Provides easy to use, powerful, C/C++ embeddable web server with optional CGI, SSL and Lua support. [MIT]
* [C++ REST SDK](https://github.com/Microsoft/cpprestsdk) - Microsoft project for cloud-based client-server communication in native code using a modern asynchronous C++ API design. [MIT]
* [CppCMS](http://cppcms.com/) - A Free High Performance Web Development Framework (not a CMS). [LGPLv3]
* [Crow](https://github.com/CrowCpp/Crow) - Crow is a C++ microframework for running web services. It uses routing similar to Python's Flask. [BSD] [website](https://crowcpp.org)
* [Cutelyst](https://github.com/cutelyst/cutelyst) - A C++ Web Framework built on top of Qt, using the simple approach of Catalyst (Perl) framework. [LGPLv2.1+] [website](https://cutelyst.org/)
* [Drogon](https://github.com/an-tao/drogon) - A C++14/17 based, high-performance HTTP application framework. [MIT]
* [facil.io](https://github.com/boazsegev/facil.io) - Evented, high performance C web framework supporting HTTP, WebSockets, SSE and more. [MIT] [website](http://facil.io)
* [Kore](https://kore.io/) - ultra fast and flexible web server / framework for web applications developed in C. [ISC]
* [libOnion](http://www.coralbits.com/libonion/) - lightweight library to help you create webservers in C programming language. [LGPLv3]
* [lwan](https://github.com/lpereira/lwan) - Experimental, scalable, high performance HTTP server. [GPL2]
* [oat++](https://github.com/oatpp/oatpp) - Light, zero-dependency framework to create high-performance web-services. [Apache-2.0] [website](https://oatpp.io/)
* [Pistache](http://pistache.io/) - Pistache is a C++ REST framework written in pure C++11 with no external dependency. [Apache2]
* [QDjango](https://github.com/jlaine/qdjango/) - A web framework written in C++ and built on top of the Qt library. Where possible it tries to follow django's API, hence its name. [LGPL]
* [TreeFrog Framework](https://github.com/treefrogframework/treefrog-framework) - High-speed and full-stack web application framework based on C++ and Qt, which supports HTTP and WebSocket protocol (with O/R mapping). [BSD] [website](http://www.treefrogframework.org/)
* [userver](https://github.com/userver-framework/userver) - Asynchronous C++17 framework with a rich set of abstractions and database drivers for fast and comfortable creation of efficient microservices, services and utilities. [Apache-2.0] [website](https://userver.tech/)
* [Wt](http://www.webtoolkit.eu/wt) - A C++ library for developing web applications. [GPL/Commercial]
## XML
*XML is crap. Really. There are no excuses. XML is nasty to parse for humans, and it's a disaster to parse even for computers. There's just no reason for that horrible crap to exist. - Linus Torvalds*
* [Boost.PropertyTree](http://www.boost.org/doc/libs/1_55_0/doc/html/property_tree.html) - A property tree parser/generator that can be used to parse XML/JSON/INI/Info files. [Boost]
* [Expat](http://www.libexpat.org/) - An XML parser library written in C. [MIT]
* [Libxml2](http://xmlsoft.org/) - The XML C parser and toolkit of Gnome. [MIT]
* [libxml++](http://libxmlplusplus.sourceforge.net/) - An XML Parser for C++. [LGPL2]
* [Mini-XML](https://github.com/michaelrsweet/mxml) - A small XML parsing library written in ANSI C. [LGPL2 with exceptions]
* [PugiXML](http://pugixml.org/) - A light-weight, simple and fast XML parser for C++ with XPath support. [MIT]
* [RapidXml](http://rapidxml.sourceforge.net/) - An attempt to create the fastest XML parser possible, while retaining useability, portability and reasonable W3C compatibility. [Boost]
* [TinyXML](http://sourceforge.net/projects/tinyxml/) - A simple, small, minimal, C++ XML parser that can be easily integrating into other programs. [zlib]
* [TinyXML2](https://github.com/leethomason/tinyxml2) - A simple, small, efficient, C++ XML parser that can be easily integrating into other programs. [zlib]
* [TinyXML++](https://github.com/rjpcomputing/ticpp) - A completely new interface to TinyXML that uses MANY of the C++ strengths. Templates, exceptions, and much better error handling. [MIT]
* [Xerces-C++](http://xerces.apache.org/xerces-c/) - A validating XML parser written in a portable subset of C++. [Apache2]
## Yaml
* [mini-yaml](https://github.com/jimmiebergmann/mini-yaml) - Single header YAML 1.0 C++11 serializer/deserializer. [MIT]
* [yaml-cpp](https://github.com/jbeder/yaml-cpp) - A YAML parser and emitter in C++ [MIT]
* [rapidyaml](https://github.com/biojppm/rapidyaml) - Rapid YAML is a C++ library to parse and emit YAML [MIT]
## Miscellaneous
*Useful libraries or tools that don't fit in the categories above or maybe just not categorised yet*
* [access_profiler](https://github.com/arvidn/access_profiler) - A tool to count accesses to member variables in c++ programs. [GPL3]
* [American fuzzy lop](http://lcamtuf.coredump.cx/afl/) a.k.a. afl-fuzz - Crazy fuzzing tool that automatically discovers bugs given time and minimal example input. [Apache2]
* [Argon2](https://github.com/P-H-C/phc-winner-argon2) - The password hash Argon2, winner of PHC. [CC0/Apache2]
* [Better String](http://bstring.sourceforge.net) - An alternative to the string library for C which is more functional and does not have buffer overflow overrun problems. Also includes a C++ wrapper. [BSD, GPL2]
* [Boost.Signals](http://www.boost.org/doc/libs/1_56_0/doc/html/signals.html) - An implementation of a managed signals and slots system. [Boost]
* [Concord](https://github.com/Cogmasters/concord) - A Discord API wrapper library written in C. [MIT] [website](https://cogmasters.github.io/concord)
* [CPPItertools](https://github.com/ryanhaining/cppitertools) - Range-based for loop add-ons inspired by the Python builtins and itertools library. [BSD-2-Clause]
* [D++ (DPP)](https://github.com/brainboxdotcc/DPP) - A lightweight, high performance and scalable C++ library for creating Discord Bots. [Apache2] [website](https://dpp.dev)
* [DynaMix](https://github.com/iboB/dynamix) - A library which allows you to compose and modify objects at run time. [MIT]
* [fccf](https://github.com/p-ranav/fccf) - A command-line tool that recursively searches a directory to find C/C++ source code matching a search string. [MIT]