Projects using erlang otp

• GitHub egitd, a replacement for stock git-daemon that ships with Git
• CouchDB, a document based database that uses MapReduce
• ejabberd, an Extensible Messaging and Presence Protocol (XMPP) instant messaging server
• Facebook chat system based on ejabberd
• RabbitMQ, an implementation of Advanced Message Queuing Protocol (AMQP)
• SimpleDB, a distributed database that is part of Amazon Web Services
• Delicious, a online bookmarks service part of Yahoo!
• T-Mobiles SMS Global Authentication System
• Erlyvideo, high efficiency multiprotocol videostreaming server
• Issuu, an online digital publisher
• Membase, database management system optimized for storing data behind interactive web applications.
• Twitterfall, a service to view trends and patterns from Twitter
• Wings 3D, a 3D modeller
• Yaws web server
• Mochiweb web server
• Much more.