Mattermost
Mattermost is a free, open-source desktop app for Windows, macOS and Linux. Mattermost Desktop application for Windows, Mac and Linux. It has 2,280 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)
Data as of from the GitHub API; description from the project's repository. Report an error
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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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: v6.3.1).
Is Mattermost still maintained?
The repository's most recent commit was on Oct 29, 2026. appsgit only lists apps whose repository had a commit in the last six months.