> /v1/alternatives/microsoft-teams
Open source alternatives to Microsoft Teams[012]
Microsoft Teams combines persistent team chat, video meetings, file sharing and app integration inside the Microsoft 365 ecosystem. Below are 12 self-hostable open source alternatives, ranked by GitHub popularity.
Rocket.Chat
The communications platform that puts data protection first
★ STARS
45.3k
⑂ FORKS
9.9k
Mattermost
Mattermost is an open source platform for secure collaboration across the entire software development lifecycle
★ STARS
36.6k
⑂ FORKS
8.6k
Nextcloud
Nextcloud server, a safe home for all your data
★ STARS
34.8k
⑂ FORKS
4.8k
Jitsi Meet
Jitsi Meet - Secure, Simple and Scalable Video Conferences
★ STARS
29.2k
⑂ FORKS
7.9k
Zulip
Zulip server and web application. Open-source team chat
★ STARS
25.2k
⑂ FORKS
9.8k
Workadventure
A collaborative web application (virtual office) presented as a 16-bit RPG video game
★ STARS
5.4k
⑂ FORKS
871
Colanode
Open-source and local-first Slack and Notion alternative that puts you in control of your data
★ STARS
4.8k
⑂ FORKS
291
Campfire
Super simple group chat, without a subscription
★ STARS
4.3k
⑂ FORKS
722
Cinny
Yet another matrix client
★ STARS
3.6k
⑂ FORKS
513
Wire
Overview of the open source code for Wire
★ STARS
2.5k
⑂ FORKS
179
UnInbox
Modern email for teams and professionals. A replacement for outdated email technology and tools. Alt to hey.com, front.com, missiveapp.com
★ STARS
1.7k
⑂ FORKS
125
twake-chat
A multi-platform (Flutter) application for connecting to Matrix - an open network for secure, decentralized communication, with your favorite devices.
★ STARS
154
⑂ FORKS
43
// EDITOR'S TAKE
No single project covers Teams, so the practical build is Mattermost or Rocket.Chat for chat, Jitsi Meet for video and Nextcloud for files and documents. Mattermost is the steadier choice for regulated or air-gapped deployments, Rocket.Chat ships more features out of the box, and Zulip's threading beats both if your channels drown in noise.
// FREQUENTLY ASKED
What is the best open source Microsoft Teams alternative?
Rocket.Chat is the most popular open source Microsoft Teams alternative by GitHub stars (45,269 stars). The other 11 options are ranked above.
Are these Microsoft Teams alternatives self-hostable?
Yes — every project listed here is open source and runs on your own infrastructure. Click into a project to see its license, stars, language, and current health status.
Are they free?
All projects shown are free and open source. Check each project's license page for the terms — most are MIT, Apache 2.0, or AGPL.
// PART OF THESE COLLECTIONS