There are 2 repositories under jabber-server topic.
Robust, Ubiquitous and Massively Scalable Messaging Platform (XMPP, MQTT, SIP Server)
(M) Highly optimized, extremely modular and very flexible XMPP/Jabber server
Nayego's backend: scalable IM server with inbox and modern channels
authentication script for prosody to hang off of a NextCloud/OwnCloud install.
opionated dockerfile for starting prosody on fedora linux