Openfire
Matrix & XMPPReal-time collaboration XMPP server written in Java
Replaces Slack, Microsoft Teams
Best LDAP Matrix & XMPP for self-hosting
The 4 best LDAP matrix & xmpp you can self-host, ranked by community traction.
Tuwunel
Matrix & XMPPSimple, fast and reliable chat server powered by Matrix based on
Replaces Conduit, Dendrite
jabberd2
Matrix & XMPPLightweight C implementation of the XMPP server
Replaces Slack
Prosody
Matrix & XMPPModern XMPP communication server
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Every option here is open-source and self-hostable, tagged LDAP within the matrix & xmpp category. Compare them on the individual app pages for setup difficulty and resource requirements.