Slack Alternatives /

open source Slack alternatives

4 of the alternatives to Slack on this site are tagged open source. The rest of the board is at Slack Alternatives, where every position says what it paid — a spot there costs $1.

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  Mattermost

  Open-source, self-hosted team messaging for security-conscious teams.

  mattermost.com · unpaid — our pick, and a position anyone can claim

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  Zulip

  Open-source chat organised by topic inside channels, so threads stay readable.

  zulip.com · unpaid — our pick, and a position anyone can claim

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  Rocket.Chat

  Open-source communications platform with full data ownership.

  rocket.chat · unpaid — our pick, and a position anyone can claim

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  Element

  Matrix-based, end-to-end encrypted messaging that federates across servers.

  element.io · unpaid — our pick, and a position anyone can claim

Looking for open source tools to replace something else? Every open source tool on the site.