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Open Source Team Chat & Messaging Tools using Vitest

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

Macro Chat

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

  • Stars

    Stars growing quickly over the last 30 days4,898

  • Last commit

    3 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

    Stars growing over the last 30 days36,420

  • Last commit

    4 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

Fluxer

Open source messaging with privacy and community focus

  • Stars

    10,650

  • Last commit

    3 hours 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
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