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Mattermost

Mattermost is a free, open-source desktop app for Windows, macOS and Linux. Mattermost Desktop application for Windows, Mac and Linux. It has 2,270 GitHub stars and is released under the Apache-2.0 license. Its source code is on GitHub at mattermost/desktop.

github.com/mattermost/desktop (opens in a new tab)

  • Official
  • Linux
  • macOS
  • Windows
  • Other
  • Actively maintained
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About Mattermost

Mattermost is an open source platform for secure collaboration across the entire software development lifecycle. This repo is for the native desktop application that's built on Electron; it runs on Windows, Mac, and Linux.

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FAQ

Mattermost FAQ

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What is Mattermost?

Mattermost is a free, open-source desktop app for Windows, macOS and Linux. Mattermost Desktop application for Windows, Mac and Linux. It has 2,270 GitHub stars and is released under the Apache-2.0 license. Its source code is on GitHub at mattermost/desktop.

Is Mattermost free and open source?

Yes. Mattermost's source code is public on GitHub under the Apache-2.0 license, which is OSI-approved or FSF-free, so you can use, copy and change it for free.

How do I install Mattermost?

Download the installer for Windows, macOS and Linux from its GitHub Releases page (latest: v6.3.0).

Is Mattermost still maintained?

The repository's most recent commit was on Oct 2, 2026. appsgit only lists apps whose repository had a commit in the last six months.