* [Cypht](http://cypht.org/index.html) - A feed reader for your email accounts - `GPL`
* [Cypht](http://cypht.org/index.html) - A feed reader for your email accounts - `GPL`
* [ejabberd](http://www.ejabberd.im) - A robust, scalable, and extensible XMPP server - `GPL``Erlang`
* [ejabberd](http://www.ejabberd.im) - A robust, scalable, and extensible XMPP server - `GPL``Erlang`
* [FreeSWITCH](https://freeswitch.org/) - Scalable open source cross-platform telephony platform `MPL``C`
* [HipChat](https://www.atlassian.com/software/hipchat) `⊘ Proprietary` - A team chat solution with 1:1 chat audio and video, third party integration and more `PHP + Python`
* [HipChat](https://www.atlassian.com/software/hipchat) `⊘ Proprietary` - A team chat solution with 1:1 chat audio and video, third party integration and more `PHP + Python`
* [Metronome](http://www.lightwitch.org/metronome) – XMPP server forked from Prosody. `MIT`
* [Metronome](http://www.lightwitch.org/metronome) – XMPP server forked from Prosody. `MIT`
* [Node-Chat](https://github.com/IgorAntun/node-chat) - A not-so-basic open-source chat with admin features. - `MIT`
* [Node-Chat](https://github.com/IgorAntun/node-chat) - A not-so-basic open-source chat with admin features. - `MIT`