This is a C implementation of bLSAG using mjosaarinen's tiny_sha3 and libsodium ristretto255 in under 200 lines of code, released to the public domain.
All you need are the blsag.{c,h} and sha3.{c,h} files and libsodium 1.0.18 or newer (for the ristretto255 implementation).
The main.c file contains an example of signature generation and verification, which can be built using CMake
cmake -B build && make -C build landing you with an executable at build/example.
Keep in mind that this bLSAG implementation has not been audited or otherwise thoroughly scrutinized and therefore is not guaranteed to be secure. Treat it as a proof of concept and an exercise, rather than a production-ready implementation. That said, if you find any bugs or vulnerabilities, please report them.