Tinode
Matrix & XMPPOpen-source instant messaging server
Replaces WhatsApp, Slack
The 26 best Docker matrix & xmpp you can self-host, ranked by community traction.
Open-source instant messaging server
Replaces WhatsApp, Slack
Glossy Matrix client for the web and desktop
Replaces Slack, Discord
Robust, scalable XMPP messaging server
Replaces Slack, WhatsApp
Second-generation Matrix homeserver written in Go
Replaces Slack, Discord
Reference homeserver for the Matrix network
Replaces Slack, Discord
Simple, elegant and secure Matrix client
Replaces Slack, Discord
Real-time collaboration XMPP server written in Java
Replaces Slack, Microsoft Teams
Simple, fast and reliable Matrix homeserver in Rust
Replaces Slack, Discord
Advanced and flexible IRC bouncer
Replaces IRCCloud
Social and chat platform built on XMPP
Replaces Facebook, Slack
Scalable, robust XMPP messaging platform
Replaces Slack, WhatsApp
Always-online web IRC client you can self-host
Replaces Slack, IRCCloud
Encrypted group video calls on Matrix
Replaces Zoom, Google Meet
Second-generation Matrix homeserver written in Go
Replaces Slack, Discord
Plugin-based bot framework for Matrix chat rooms
Replaces Slack bots
Community-maintained Rust Matrix homeserver
Replaces Slack, Discord
Bridge connecting Signal messaging to Matrix
Replaces Signal
Element-based Matrix client with extra usability tweaks
Replaces Slack, WhatsApp
Web admin interface for Synapse Matrix homeservers
Highly scalable XMPP/Jabber messaging server
Replaces Slack, WhatsApp
End-to-end encryption-aware Matrix reverse proxy
Standalone sync proxy enabling fast Matrix clients
OAuth2 and OIDC authentication service for Matrix
Reference push notification gateway for Matrix
Replaces Firebase Cloud Messaging
Reconciliator and gateway for managed Matrix homeservers
Replaces Slack admin tools
Well-maintained fork of the Conduit Matrix homeserver
Replaces Slack, Discord
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Every option here is open-source and self-hostable, tagged Docker within the matrix & xmpp category. Compare them on the individual app pages for setup difficulty and resource requirements.