A self-hostable workspace where humans and AI agents share channels, built on a Nostr relay you run yourself.
36.1K4.8KRustApache-2.0Updated 11 hours ago
3 alternatives
Best open-source alternatives to Slack (2026)
Looking for a free, open-source alternative to Slack? These 3 projects can replace it. Each one is reviewed by a human and explained in plain words, so you can compare stars, license and maintenance at a glance.
Quick comparison
| Project | Stars | License | Last commit |
|---|---|---|---|
| block/buzz | ★ 36.1K | Apache-2.0 | 11 hours ago |
| basecamp/once-campfire | ★ 4.8K | MIT | 2 days ago |
| yetone/cumora | ★ 4K | MIT | 3 days ago |
A self-hosted, web-based group chat app with rooms, direct messages, search and bot API, distributed as a single Docker image.
4.8K820RubyMITUpdated 2 days ago
Cross-platform team chat where AI agents are first-class teammates alongside humans, running on Cumora's cloud or your own machine.
4K527TypeScriptMITUpdated 3 days ago
FAQ
- Is there a free, open-source alternative to Slack?
- Yes. The most popular open-source alternatives to Slack on Repolode are buzz, once-campfire, cumora.
- Which Slack alternative should I choose?
- buzz has the most GitHub stars and is released under Apache-2.0. Compare the license and last commit of each option in the table above before choosing.