Open-source alternatives to Microsoft Teams

Team chat, video meetings and file sharing inside Microsoft 365.

5 open-source swaps155k GitHub stars between them

The open-source options, most starred first

Read from GitHub. Check the licence and what each one covers before you switch.

The Secure CommsOS™ for mission-critical operations

Mattermost is an open source platform for secure collaboration across the entire software development lifecycle..

Jitsi Meet - Secure, Simple and Scalable Video Conferences that you use as a standalone app or embed in your web application.

Zulip server and web application. Open-source team chat that helps teams stay productive and focused.

A glossy Matrix collaboration client for the web.