Dino
Matrix & XMPPModern XMPP chat client for the desktop
Replaces Skype, Slack
Best Free Matrix & XMPP for self-hosting
The 36 best Free matrix & xmpp you can self-host, ranked by community traction.
Nheko
Matrix & XMPPDesktop Matrix client with native Qt interface
Replaces Slack, Discord
Tuwunel
Matrix & XMPPSimple, fast and reliable chat server powered by Matrix based on
Replaces Conduit, Dendrite
mautrix-whatsapp
Matrix & XMPPMatrix-WhatsApp puppeting bridge
Replaces WhatsApp official client
gomuks
Matrix & XMPPTerminal-based Matrix client written in Go
Replaces Slack, Discord
Profanity
Matrix & XMPPConsole-based XMPP client inspired by irssi
Replaces Slack
Convos IRC
Matrix & XMPPAlways-online web IRC client you can self-host
Replaces Slack, IRCCloud
Syphon
Matrix & XMPPPrivacy-focused Matrix client built with Flutter
Replaces WhatsApp, Discord
Dendrite Lite
Matrix & XMPPSecond-generation Matrix homeserver written in Go
Replaces Slack, Discord
Fractal
Matrix & XMPPGNOME-native Matrix messaging client
Replaces Slack, Discord
Maubot
Matrix & XMPPPlugin-based bot framework for Matrix chat rooms
Replaces Slack bots
Hydrogen
Matrix & XMPPWeb client for Matrix
matrix-nio
Matrix & XMPPPython library for building Matrix clients and bots
Replaces Slack bot SDK
Continuwuity
Matrix & XMPPCommunity-maintained Rust Matrix homeserver
Replaces Slack, Discord
mautrix-signal
Matrix & XMPPBridge connecting Signal messaging to Matrix
Replaces Signal
CoyIM
Matrix & XMPPSecure desktop XMPP client with OTR encryption
Replaces Skype
Gajim
Matrix & XMPPFull-featured XMPP client with plugins
Replaces Skype, Slack
mautrix-discord
Matrix & XMPPMatrix-Discord puppeting bridge
Replaces Discord official client
Ketesa
Matrix & XMPPAdmin UI for Matrix homeservers
jabberd2
Matrix & XMPPLightweight C implementation of the XMPP server
Replaces Slack
Mjolnir
Matrix & XMPPModeration bot for Matrix communities
Replaces Discord moderation bots
matrix-appservice-slack
Matrix & XMPPMatrix-Slack bridge application service
Replaces Slack official client
aioxmpp
Matrix & XMPPPure-Python XMPP client library and toolkit
Replaces Slack bots
Poezio
Matrix & XMPPConsole XMPP client modeled after IRC clients
Replaces Slack
Slidge
Matrix & XMPPXMPP-to-anything puppeteering bridge framework
Replaces Beeper, Matrix bridges
Sygnal
Matrix & XMPPReference push notification gateway for Matrix
Replaces Firebase Cloud Messaging
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
Commet
Matrix & XMPPCross-platform Matrix client built with Flutter
Replaces Discord, Slack
Monocles Chat
Matrix & XMPPPrivacy-focused XMPP messenger for Android
Replaces WhatsApp, Signal
go-sendxmpp
Matrix & XMPPCommand-line tool to send XMPP messages
Replaces Slack incoming webhooks
Simple-Matrix-Bot-Lib
Matrix & XMPPBeginner-friendly framework for Matrix bots
Replaces Slack bot framework
Openfire Pade Plugin
Matrix & XMPPMeetings and messaging plugin for Openfire
Replaces Zoom, Slack
Prose
Matrix & XMPPXMPP client for team messaging
Replaces Discord, Facebook Messenger
Prosody
Matrix & XMPPModern XMPP communication server
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Every option here is open-source and self-hostable, tagged Free within the matrix & xmpp category. Compare them on the individual app pages for setup difficulty and resource requirements.