esl/MongooseIM
MongooseIM is Erlang Solutions' robust, scalable and efficient XMPP server, aimed at large installations. Specifically designed for enterprise purposes, it is fault-tolerant and can utilise the resources of multiple clustered machines.
GitHub repository with 1,743 stars and 439 forks.
Language: Erlang
Topics: chat, erlang, hacktoberfest, jabber, messaging, mongooseim, xmpp