- [Metronome IM](https://metronome.im/) - Lightweight xmpp server with advanced microblogging features (fork of Prosody). ([Source Code](https://github.com/maranda/metronome)) `MIT``Lua`
- [MongooseIM](https://www.erlang-solutions.com/products/mongooseim.html) - Mobile messaging platform with a focus on performance and scalability. ([Source Code](https://github.com/esl/MongooseIM)) `GPL-2.0``Erlang/Docker/K8S`
- [MongooseIM](https://www.erlang-solutions.com/products/mongooseim.html) - Mobile messaging platform with a focus on performance and scalability. ([Source Code](https://github.com/esl/MongooseIM)) `GPL-2.0``Erlang/Docker/K8S`
- [Openfire](https://www.igniterealtime.org/projects/openfire/) - Real time collaboration (RTC) server. ([Source Code](https://github.com/igniterealtime/Openfire)) `Apache-2.0``Java`
- [Openfire](https://www.igniterealtime.org/projects/openfire/) - Real time collaboration (RTC) server. ([Source Code](https://github.com/igniterealtime/Openfire)) `Apache-2.0``Java`
- [Prosody IM](https://prosody.im/) - Feature-rich and easy to configure XMPP server. ([Source Code](https://hg.prosody.im/)) `MIT``Lua`
- [Prosody IM](https://prosody.im/) - Feature-rich and easy to configure XMPP server. ([Source Code](https://hg.prosody.im/)) `MIT``Lua`