There are 7 repositories under jabber topic.
Robust, Ubiquitous and Massively Scalable Messaging Platform (XMPP, MQTT, SIP Server)
Conversations is an open source XMPP/Jabber client for Android
Web-based XMPP/Jabber chat client written in JavaScript
An XMPP server licensed under the Open Source Apache License.
A modular and portable open source XMPP client library written in Java for Android and Java (SE) VMs
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.
Ncurses based XMPP client
Cross-platform real-time collaboration client optimized for business and organizations.
Miranda NG: Next Generation of Miranda IM
(M) Highly optimized, extremely modular and very flexible XMPP/Jabber server
Jabber-транспорт для ВКонтакте (A jabber gateway to the VK social network)
Open source XMPP client for Web
Terminal shell accessible through a jabber connection
A curated list of amazingly awesome XMPP server, clients, libraries, resources - with focus on security.
Zabbix notifications to Viber, SMS, Voice Call, MS Teams, ...