Rocket.Chat
Team ChatOpen-source team chat and collaboration platform
Replaces Slack, Microsoft Teams
60 self-hosted Slack alternatives
Slack is a commercial team messaging platform organized into channels, with integrations, voice, and video. It is widely used for workplace communication. These open-source apps let you replace Slack with software you host and control yourself.
Best self-hosted Slack alternatives
Mattermost
Team ChatSecure collaboration for developer teams
Replaces Slack, Microsoft Teams
Zulip
Team ChatThreaded team chat that combines email and chat
Replaces Slack, Microsoft Teams
Tinode
Matrix & XMPPOpen-source instant messaging server
Replaces WhatsApp, Slack
Element Web
Matrix & XMPPGlossy Matrix client for the web and desktop
Replaces Slack, Discord
Let's Chat
Team ChatSelf-hosted chat app for small teams
Replaces Slack, HipChat
Matterbridge
Team ChatBridge messages between many chat platforms
Replaces Slack
ejabberd
Matrix & XMPPRobust, scalable XMPP messaging server
Replaces Slack, WhatsApp
The Lounge
Chat & CommunicationModern, self-hosted web IRC client
Replaces IRCCloud, Slack
Dendrite
Matrix & XMPPSecond-generation Matrix homeserver written in Go
Replaces Slack, Discord
Synapse
Matrix & XMPPReference homeserver for the Matrix network
Replaces Slack, Discord
Cinny
Matrix & XMPPSimple, elegant and secure Matrix client
Replaces Slack, Discord
WeeChat
Chat & CommunicationExtensible terminal-based chat client
Replaces Slack
Ergo
Chat & CommunicationModern IRC server with IRCv3 and bouncer features
Replaces Slack, Discord
Converse.js
Matrix & XMPPWeb-based XMPP/Jabber chat client
Replaces Slack
irssi
Chat & CommunicationModular terminal IRC client with scripting
Replaces Slack
Openfire
Matrix & XMPPReal-time collaboration XMPP server written in Java
Replaces Slack, Microsoft Teams
Dino
Matrix & XMPPModern XMPP chat client for the desktop
Replaces Skype, Slack
Nheko
Matrix & XMPPDesktop Matrix client with native Qt interface
Replaces Slack, Discord
Conduit
Matrix & XMPPSimple, fast and reliable Matrix homeserver in Rust
Replaces Slack, Discord
Nextcloud Talk
Chat & CommunicationChat, video calls and webinars integrated into Nextcloud
Replaces Slack, Zoom
Movim
Matrix & XMPPSocial and chat platform built on XMPP
Replaces Facebook, Slack
Twake Workplace
GroupwareOpen-source digital workplace and collaboration suite
Replaces Microsoft Teams, Slack
MongooseIM
Matrix & XMPPScalable, robust XMPP messaging platform
Replaces Slack, WhatsApp
gomuks
Matrix & XMPPTerminal-based Matrix client written in Go
Replaces Slack, Discord
Profanity
Matrix & XMPPConsole-based XMPP client inspired by irssi
Replaces Slack
InspIRCd
Chat & CommunicationModular C++ Internet Relay Chat daemon
Replaces Slack, Discord
Convos IRC
Matrix & XMPPAlways-online web IRC client you can self-host
Replaces Slack, IRCCloud
KiwiIRC
Chat & CommunicationHosted-anywhere modern web IRC client
Replaces Slack, Discord
Glowing Bear
Chat & CommunicationWeb front end for the WeeChat IRC relay
Replaces IRCCloud, Slack
Dendrite Lite
Matrix & XMPPSecond-generation Matrix homeserver written in Go
Replaces Slack, Discord
Fractal
Matrix & XMPPGNOME-native Matrix messaging client
Replaces Slack, Discord
Zulip Terminal
Team ChatTerminal client for the Zulip team chat platform
Replaces Slack
Quassel IRC
Chat & CommunicationDistributed IRC client with an always-on core
Replaces Slack
JSXC
Matrix & XMPPJavaScript XMPP client for the browser
Replaces Slack
Continuwuity
Matrix & XMPPCommunity-maintained Rust Matrix homeserver
Replaces Slack, Discord
Spark IM
Team ChatCross-platform XMPP instant messaging client
Replaces Slack, Skype
Gajim
Matrix & XMPPFull-featured XMPP client with plugins
Replaces Skype, Slack
ngIRCd
Chat & CommunicationLightweight Unix IRC server that is easy to configure
Replaces Slack
Miaou
Chat & CommunicationSelf-hosted multi-room chat with markdown and code blocks
Replaces Discord, Slack
UnrealIRCd
Chat & CommunicationHighly configurable open-source IRC server
Replaces Slack, Discord
SchildiChat
Matrix & XMPPElement-based Matrix client with extra usability tweaks
Replaces Slack, WhatsApp
jabberd2
Matrix & XMPPLightweight C implementation of the XMPP server
Replaces Slack
Hookshot
Chat & CommunicationMatrix bridge for GitHub, GitLab, Jira and webhooks
Replaces Slack
Atheme IRC Services
Chat & CommunicationModular IRC services framework for large networks
Replaces Slack
Construct
Matrix & XMPPHigh-performance Matrix homeserver written in C++
Replaces Slack, Discord
Anope
Chat & CommunicationIRC services suite for nickname and channel registration
Replaces Slack
Tigase XMPP Server
Matrix & XMPPHighly scalable XMPP/Jabber messaging server
Replaces Slack, WhatsApp
Comm
Chat & CommunicationE2E-encrypted personal-server messaging app
Replaces Discord, Slack
Tracim
Office SuitesCollaborative platform intended for team collaboration
Replaces Dropbox, Google Drive
Solanum
Chat & CommunicationIRCv3 server daemon used by Libera.Chat
Replaces Slack, Discord
Charybdis IRCd
Chat & CommunicationIRC server daemon for large networks
Replaces Discord, Slack
Poezio
Matrix & XMPPConsole XMPP client modeled after IRC clients
Replaces Slack
ircd-hybrid
Chat & CommunicationLightweight and stable IRC server daemon
Replaces Slack, Discord
Metronome IM
Matrix & XMPPLightweight, fork-based XMPP communication server
Replaces Slack, WhatsApp
Commet
Matrix & XMPPCross-platform Matrix client built with Flutter
Replaces Discord, Slack
ircu2
Chat & CommunicationIRC server daemon used by the Undernet network
Replaces Discord, Slack
Openfire Pade Plugin
Matrix & XMPPMeetings and messaging plugin for Openfire
Replaces Zoom, Slack
Libervia
Chat & CommunicationMulti-frontend XMPP communication ecosystem
Replaces Slack, Facebook
conduwuit
Matrix & XMPPWell-maintained fork of the Conduit Matrix homeserver
Replaces Slack, Discord
No apps match these filters.
Compare Slack alternatives
- Anope vs The Lounge
- Atheme IRC Services vs The Lounge
- Charybdis IRCd vs The Lounge
- Cinny vs Commet
- Cinny vs jabberd2
- Cinny vs Metronome IM
- Cinny vs Conduit
- Cinny vs conduwuit
- Cinny vs Continuwuity
- Cinny vs Converse.js
- Cinny vs Dino
- Cinny vs ejabberd
- Cinny vs Element Web
- Cinny vs Ergo
- Cinny vs Fractal
- Cinny vs Gajim
- Cinny vs gomuks
- Cinny vs InspIRCd
- Cinny vs irssi
- Cinny vs JSXC
- Cinny vs KiwiIRC
- Cinny vs Let's Chat
- Cinny vs Tinode
- Cinny vs Convos IRC
- Cinny vs Dendrite Lite
- Cinny vs Construct
- Cinny vs Dendrite
- Cinny vs Matterbridge
- Cinny vs Mattermost
- Cinny vs Miaou
- Cinny vs MongooseIM
- Cinny vs Movim
- Cinny vs Nextcloud Talk
- Cinny vs Nheko
- Cinny vs Openfire Pade Plugin
- Cinny vs Poezio
- Cinny vs Profanity
- Cinny vs Rocket.Chat
- Cinny vs SchildiChat
- Cinny vs Synapse
Switching from Slack
Moving off Slack means trading a managed subscription for a service you run yourself. The payoff is ownership: no per-seat pricing, no vendor lock-in, and full control of your data. Start with the option above that matches your setup-difficulty comfort level — every app links to a detailed specs page and head-to-head comparisons.