Tinode
Matrix & XMPPOpen-source instant messaging server
Replaces WhatsApp, Slack
Best API Matrix & XMPP for self-hosting
The 20 best API matrix & xmpp you can self-host, ranked by community traction.
ejabberd
Matrix & XMPPRobust, scalable XMPP messaging server
Replaces Slack, WhatsApp
Dendrite
Matrix & XMPPSecond-generation Matrix homeserver written in Go
Replaces Slack, Discord
mautrix-whatsapp
Matrix & XMPPMatrix-WhatsApp puppeting bridge
Replaces WhatsApp official client
MongooseIM
Matrix & XMPPScalable, robust XMPP messaging platform
Replaces Slack, WhatsApp
Maubot
Matrix & XMPPPlugin-based bot framework for Matrix chat rooms
Replaces Slack bots
matrix-nio
Matrix & XMPPPython library for building Matrix clients and bots
Replaces Slack bot SDK
mautrix-discord
Matrix & XMPPMatrix-Discord puppeting bridge
Replaces Discord official client
Synapse Admin
Matrix & XMPPWeb admin interface for Synapse Matrix homeservers
Mjolnir
Matrix & XMPPModeration bot for Matrix communities
Replaces Discord moderation bots
Construct
Matrix & XMPPHigh-performance Matrix homeserver written in C++
Replaces Slack, Discord
Pantalaimon
Matrix & XMPPEnd-to-end encryption-aware Matrix reverse proxy
Sliding Sync Proxy
Matrix & XMPPStandalone sync proxy enabling fast Matrix clients
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
Slidge
Matrix & XMPPXMPP-to-anything puppeteering bridge framework
Replaces Beeper, Matrix bridges
Sygnal
Matrix & XMPPReference push notification gateway for Matrix
Replaces Firebase Cloud Messaging
matrix-corporal
Matrix & XMPPReconciliator and gateway for managed Matrix homeservers
Replaces Slack admin tools
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
No apps match these filters.
Every option here is open-source and self-hostable, tagged API within the matrix & xmpp category. Compare them on the individual app pages for setup difficulty and resource requirements.