Tinode
Matrix & XMPPOpen-source instant messaging server
Replaces WhatsApp, Slack
Best Multi-User Matrix & XMPP for self-hosting
The 24 best Multi-User matrix & xmpp you can self-host, ranked by community traction.
ejabberd
Matrix & XMPPRobust, scalable XMPP messaging server
Replaces Slack, WhatsApp
Synapse
Matrix & XMPPReference homeserver for the Matrix network
Replaces Slack, Discord
Openfire
Matrix & XMPPReal-time collaboration XMPP server written in Java
Replaces Slack, Microsoft Teams
ZNC
Matrix & XMPPAdvanced and flexible IRC bouncer
Replaces IRCCloud
Movim
Matrix & XMPPSocial and chat platform built on XMPP
Replaces Facebook, Slack
mautrix-whatsapp
Matrix & XMPPMatrix-WhatsApp puppeting bridge
Replaces WhatsApp official client
MongooseIM
Matrix & XMPPScalable, robust XMPP messaging platform
Replaces Slack, WhatsApp
Convos IRC
Matrix & XMPPAlways-online web IRC client you can self-host
Replaces Slack, IRCCloud
Element Call
Matrix & XMPPEncrypted group video calls on Matrix
Replaces Zoom, Google Meet
Dendrite Lite
Matrix & XMPPSecond-generation Matrix homeserver written in Go
Replaces Slack, Discord
Hydrogen
Matrix & XMPPWeb client for Matrix
mautrix-discord
Matrix & XMPPMatrix-Discord puppeting bridge
Replaces Discord official client
Synapse Admin
Matrix & XMPPWeb admin interface for Synapse Matrix homeservers
jabberd2
Matrix & XMPPLightweight C implementation of the XMPP server
Replaces Slack
Mjolnir
Matrix & XMPPModeration bot for Matrix communities
Replaces Discord moderation bots
Tigase XMPP Server
Matrix & XMPPHighly scalable XMPP/Jabber messaging server
Replaces Slack, WhatsApp
matrix-appservice-slack
Matrix & XMPPMatrix-Slack bridge application service
Replaces Slack official client
Slidge
Matrix & XMPPXMPP-to-anything puppeteering bridge framework
Replaces Beeper, Matrix bridges
Metronome IM
Matrix & XMPPLightweight, fork-based XMPP communication server
Replaces Slack, WhatsApp
matrix-corporal
Matrix & XMPPReconciliator and gateway for managed Matrix homeservers
Replaces Slack admin tools
PeerTube Plugin LiveChat
Matrix & XMPPPlugin adding live chat to PeerTube streams
Replaces Twitch chat
Openfire Pade Plugin
Matrix & XMPPMeetings and messaging plugin for Openfire
Replaces Zoom, Slack
Prose
Matrix & XMPPXMPP client for team messaging
Replaces Discord, Facebook Messenger
No apps match these filters.
Every option here is open-source and self-hostable, tagged Multi-User within the matrix & xmpp category. Compare them on the individual app pages for setup difficulty and resource requirements.