Team Chat & Messaging

15 self-hosted open source alternatives in this category

Rocket.Chat

Secure team messaging with channels, DMs, and omnichannel support

Self-hosted team chat platform with channels, DMs, voice/video, rich integrations, and omnichannel customer support features.

Alternative to:

Slack+9

Mattermost

Secure team messaging for technical and operational teams

34.9k

8.3k

Last commit: 1d ago

Self-hostable team chat with channels, threads, calls, integrations, and enterprise-grade security controls for organizations that need full data control.

Alternative to:

Slack+4

Jitsi Meet

Open-source video meetings built on WebRTC

28.3k

7.7k

Last commit: 1d ago

Self-hostable video conferencing with browser-based meetings, screen sharing, chat, moderation tools, and optional end-to-end encryption.

Alternative to:

Zoom+9

Zulip

Threaded team chat organized by topic streams

24.2k

9.3k

Last commit: 28d ago

Self-hostable team chat with topic-based threading, powerful search, and integrations for engineering and communities.

Alternative to:

Slack+4

Gotify

Self-hosted push notifications with apps and API

14.4k

800

Last commit: 1d ago

Gotify is a self-hosted push notification server with a web UI, Android client, and REST API for sending messages from scripts, services, and monitoring tools.

Alternative to:

Pushover+7

SimpleX Chat

Private messaging without user IDs or phone numbers

10.2k

538

Last commit: 11d ago

Privacy-first messenger using SimpleX relays and end-to-end encryption, designed to avoid user identifiers, phone numbers, and centralized identity.

Alternative to:

Signal+5

Mumble

Low-latency, high-quality voice chat with server-based channels

7.5k

1.3k

Last commit: 12d ago

Open-source VoIP voice chat with low latency, positional audio, access control, and a self-hostable server (Murmur) for teams and communities.

Alternative to:

Discord+9

The Lounge

Modern web IRC client with multi-network support

6.1k

732

Last commit: 6d ago

A self-hosted, browser-based IRC client with persistent connections, multi-user access, theming, and extensibility via plugins.

Alternative to:

Kiwi IRC+2

Synapse

Matrix homeserver for decentralized, federated messaging

3.3k

435

Last commit: 1d ago

A Matrix homeserver that powers federated real-time chat with accounts, rooms, APIs, and integrations for clients like Element.

Alternative to:

Slack+4

Converse

Embeddable XMPP web chat client for websites and platforms

3.2k

801

Last commit: 3d ago

Converse is an open-source, browser-based XMPP/Jabber chat client you can embed in any site to provide 1:1 and group messaging over existing XMPP servers.

Alternative to:

Slack+6

Ergo

Modern IRCv3 server with integrated services

220

Last commit: 8d ago

Ergo is a modern, self-contained IRCv3 server with integrated services (NickServ/ChanServ), TLS, history playback, bouncers, and extensive IRCv3 capability support.

Alternative to:

Discord+5

AnyCable

Polyglot, high-performance WebSocket server for Action Cable

2.2k

110

Last commit: 3d ago

AnyCable is a scalable WebSocket server for Ruby on Rails Action Cable, offering a Go server with RPC to Rails and support for Redis and other brokers.

Alternative to:

Pusher Channels+4

Chitchatter

Peer-to-peer, serverless, ephemeral chat with E2EE

2.1k

344

Last commit: 9d ago

Chitchatter is a serverless, peer-to-peer chat app that uses WebRTC and end-to-end encryption for ephemeral rooms without storing messages on a central server.

Alternative to:

Discord+4