- [jackal](https://github.com/ortuman/jackal) - XMPP server with focus on stability, simple configuration and low resource consumption. `Apache-2.0``Go`
- [jackal](https://github.com/ortuman/jackal) - XMPP server with focus on stability, simple configuration and low resource consumption. `Apache-2.0``Go/Docker`
- [Metronome IM](https://metronome.im/) - Fork of Prosody IM. ([Source Code](https://github.com/maranda/metronome)) `MIT``Lua`
- [Metronome IM](https://metronome.im/) - Fork of Prosody IM. ([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`
- [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`
- [Snikket](https://snikket.org/) - All-in-one Dockerized easy XMPP solution, including web admin and clients. ([Source Code](https://github.com/snikket-im/snikket-server), [Clients](https://snikket.org/app/)) `Apache-2.0``Lua/Python`
- [Snikket](https://snikket.org/) - All-in-one Dockerized easy XMPP solution, including web admin and clients. ([Source Code](https://github.com/snikket-im/snikket-server), [Clients](https://snikket.org/app/)) `Apache-2.0``Docker`
- [Tigase](https://tigase.net/xmpp-server) - XMPP server implementation in Java. `GPL-3.0``Java`
- [Tigase](https://tigase.net/xmpp-server) - XMPP server implementation in Java. ([Source Code](https://github.com/tigase/tigase-server)) `GPL-3.0``Java`