The best Open Source alternatives to Microsoft Teams in 2026
We compare 1 self-hostable tool you can deploy on your own server in minutes, with license, tech stack and a ready-to-copy docker-compose.
Mattermost
Alternative to Slack, Microsoft Teams
Security-focused team chat and collaboration, an alt. to Slack.
MIT 30k
Docker Ready1-Click DeployPermissive License
View profile and deployment guide