Free & Open-Source Slack Business+ Alternatives

Premium team messaging and collaboration.

1. Element ↗ FOSSPRIVATESELF-HOST
   Matrix-based encrypted chat with bridges.
   ●●○Medium · Federated, no central server
2. Mattermost ↗ FOSSPRIVATESELF-HOST
   Open-source team chat for enterprises.
   ●●○Medium · Requires self-hosting
3. Rocket.Chat ↗ FOSSPRIVATESELF-HOST
   Self-hosted Slack alternative with full feature set.
   ●●○Medium · Requires self-hosting