Submit
Ad
Learn more

Open Source Team Chat & Messaging Tools

A curated collection of the best open source platforms for real-time team messaging, with channels, direct messages, threads, file sharing, and app integrations..

Macro Chat

Team chat with email, tasks, and docs in one workspace

  • Stars

    Stars growing quickly over the last 30 days6,236

  • Last commit

    2 hours ago

  • License

    AGPL-3.0
Team chat app with inline threads, mention-based sharing, a unified inbox for chat and email, and an AI agent that works across your full workspace.

Open Source Alternative to:

Discord

Buzz

Team chat, project management, and AI agents in one place

  • Stars

    36,843

  • Last commit

    2 hours ago

  • License

    Apache-2.0
Workspace that combines team chat, project planning, and git management with AI agents that collaborate alongside your team on shared context.

Open Source Alternative to:

Microsoft Teams

Rocket.Chat

Self-hosted team messaging with voice, video, and AI

  • Stars

    46,386

  • Last commit

    2 hours ago

  • License

    MIT
Open source communication platform combining messaging, voice, video, and AI for organizations that need full data control, air-gapped deployments, and zero-trust security.

Open Source Alternative to:

Discord

Mattermost

Secure collaboration platform for mission-critical work

  • Stars

    39,570

  • Last commit

    2 hours ago

  • License

    Unknown
Mattermost provides a flexible, open-source platform for secure team collaboration, designed for organizations with strict security and privacy requirements.

Open Source Alternative to:

Microsoft Teams

Zulip

Organized team chat for distributed teams

  • Stars

    26,202

  • Last commit

    4 hours ago

  • License

    Apache-2.0
Zulip is an open-source team chat app that uses threaded conversations to keep communication organized and efficient for teams of all sizes.

Open Source Alternative to:

Microsoft Teams

Fluxer

Open source messaging with privacy and community focus

  • Stars

    10,838

  • Last commit

    1 day ago

  • License

    AGPL-3.0
Free, open-source instant messaging and VoIP platform with full Markdown support, voice/video calls, moderation tools, and self-hosting options for communities.

Open Source Alternative to:

Discord

Element

Secure, decentralized messaging for teams and individuals

  • Stars

    13,651

  • Last commit

    5 hours ago

  • License

    AGPL-3.0
Open-source platform for encrypted communication, file sharing, and collaboration based on the Matrix protocol.

Open Source Alternative to:

Discord

Campfire

Self-hosted group chat without recurring subscription fees

  • Stars

    4,821

  • Last commit

    4 days ago

  • License

    MIT
Install your own group chat system with @mentions, DMs, and mobile support. One-time purchase, no monthly fees. Includes full source code for customization.

Open Source Alternative to:

Microsoft Teams

Cinny

Secure and elegant Matrix client for seamless conversations

  • Stars

    3,977

  • Last commit

    1 day ago

  • License

    AGPL-3.0
Cinny offers a simple, elegant, and secure interface for Matrix-based conversations, protected by end-to-end encryption.

Open Source Alternative to:

Discord

Stoat

Group chat for friends and communities, without the baggage

  • Stars

    3,463

  • Last commit

    3 hours ago

  • License

    Unknown
Self-hostable group chat with servers, channels, voice, and moderation tools. No ads, no data mining, built under EU privacy law.

Open Source Alternative to:

Discord

Quiet

Serverless team chat over Tor, no phone number needed

  • Stars

    2,663

  • Last commit

    8 days ago

  • License

    GPL-3.0
Quiet is a peer-to-peer messaging app that syncs messages directly between devices over Tor, with no central server, no phone number required, and no metadata leaks.

Open Source Alternative to:

Discord

Mezon

Create custom spaces to chat, game, and connect globally

  • Stars

    2,020

  • Last commit

    3 hours ago

  • License

    MIT
Build your own community space for gaming, chatting, and hanging out with friends worldwide. Customize your environment for the perfect social experience.

Open Source Alternative to:

Discord

Wire

Secure collaboration platform with end-to-end encryption

  • Stars

    2,556

  • Last commit

    10 months ago

  • License

    GPL-3.0
A comprehensive collaboration platform offering end-to-end encrypted messaging, file sharing, and video calls with enterprise-grade security and compliance features.

Open Source Alternative to:

Discord

UnInbox

Transform team email into efficient collaborative workflows

  • Stars

    1,760

  • Last commit

    9 months ago

  • License

    AGPL-3.0
Streamline team communication with shared inboxes, unlimited email addresses, and customizable workflows. Perfect for modern businesses seeking organized email management.

Open Source Alternative to:

Gmail

Hazel

Team chat with native GitHub and Linear integrations

  • Stars

    735

  • Last commit

    2 hours ago

  • License

    FSL-1.1-ALv2
Team chat for developers with threads, full-text search, keyboard-first navigation, GitHub and Linear previews, desktop apps, and message sync with Slack and Discord.

Open Source Alternative to:

Discord

Ethora

Messaging SDK with AI agents for web, iOS, and Android

  • Stars

    552

  • Last commit

    21 hours ago

  • License

    Apache-2.0
Build branded chat apps with AI agents, group messaging, document exchange, and digital wallets using React and React Native components.

Open Source Alternative to:

Stream

Twake Chat

Secure open source messaging for professional teams

  • Stars

    173

  • Last commit

    4 hours ago

  • License

    AGPL-3.0
Free Matrix-based messenger with end-to-end encryption, multi-platform bridges, and on-premise deployment. Connect across 30+ networks securely.

Open Source Alternative to:

WhatsApp
Ad

 
Ad