The Secure CommsOS™ for mission-critical operations
Channels, threads and federation, self-hosted.
- Language
- TypeScript
- Licence
- Other
- Stars
- 46k
- Latest
- 8.8.1
- Last push
- 2026-09-22
← backRocket.ChatFull replacement ZulipFull replacement
Mattermost
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- v12.0.0-rc12026-09-18Mattermost Platform Release 12.0.0-rc1pre-release
- v10.11.242026-09-16Mattermost Platform Extended Support Release 10.11.24 contains a High severity level security fix.
- v11.10.22026-09-15Mattermost Platform Release 11.10.2 contains Medium to High severity level security fixes.
- v11.7.112026-09-15Mattermost Platform Extended Support Release 11.7.11 contains Low to High severity level security fixes.
- v11.7.11-rc12026-09-11Mattermost Platform Release 11.7.11-rc1pre-release
✓ signed The latest release, v11.11.0, carries a signature GitHub verified.
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Zulip server and web application. Open-source team chat that helps teams stay productive and focused.
Conversations split into topics inside each channel.
- Language
- Python
- Licence
- Apache-2.0
- Stars
- 26k
- Latest
- 12.3
- Last push
- 2026-09-22