Mattermost
Platform for secure collaboration across the entire software development lifecycle, can be integrated with Gitlab (alternative to Slack).
- Team Chat
- TypeScript
- ⊘ Proprietary
- Docker
- Actively maintained
GitHub stats
- GitHub stars
- 39,271
- Forks
- 9,036
- Open issues
- 615
- Commits, last 12 months
- 1,913
- Last commit
- Oct 6, 2026
- Latest release
- v11.11.1Sep 24, 2026
- Created
- Jun 15, 2015
Data from the GitHub API, refreshed daily.
About Mattermost
Platform for secure collaboration across the entire software development lifecycle, can be integrated with Gitlab (alternative to Slack). Mattermost is open source under the ⊘ Proprietary license and written mainly in TypeScript, so you can read the code, run it on your own hardware and keep full control of your data.
The project has 39,271 stars and 9,036 forks on GitHub, with 1,913 commits over the last year. It ships a Docker image, which makes it a good fit for a small VPS or a home server running Docker Compose.
Topics
- collaboration
- mattermost
- golang
- react-native
- hacktoberfest
- monorepo
- react
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What is Mattermost?
Mattermost is a free, open-source app you can host on your own server, listed in our Team Chat category. Platform for secure collaboration across the entire software development lifecycle, can be integrated with Gitlab (alternative to Slack). The source code lives at github.com/mattermost/mattermost, where it has 39,271 stars.
Is Mattermost free and open source?
Yes. Mattermost is open-source software released under the ⊘ Proprietary license, so you can self-host it at no cost. You only pay for the server it runs on, and some projects also offer an optional paid cloud plan.
Can I run Mattermost with Docker?
Yes. Mattermost provides a Docker image, so you can run it on any Linux server with Docker and Docker Compose installed. The project README lists the image name and the environment variables to set.
What are the best alternatives to Mattermost?
Popular open-source alternatives to Mattermost include Rocket.Chat, Novu and Chatwoot. Mattermost itself is a self-hosted alternative to Slack.
Is Mattermost actively maintained?
The most recent commit to Mattermost was on Oct 6, 2026 with 1,913 commits in the past twelve months. The latest release is v11.11.1, published Sep 24, 2026. Check the open issues on GitHub to gauge how quickly maintainers respond.