Mattermost
Mattermost is a free, open-source remote desktop app for Linux. Mattermost is an open source platform for secure collaboration across the entire software development lifecycle. It has 39,455 GitHub stars and is released under the AGPL-3.0 license. Its source code is on GitHub at mattermost/mattermost.
github.com/mattermost/mattermost (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 core, self-hosted collaboration platform that offers chat, workflow automation, voice calling, screen sharing, and AI integration. This repo is the primary source for core development on the Mattermost platform; it's written in Go and React, runs as a single Linux binary, and relies on PostgreSQL. A new compiled version is released under an MIT license every month on the 16th.
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Is Mattermost free and open source?
Yes. Mattermost's source code is public on GitHub under the AGPL-3.0 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 Linux from its GitHub Releases page (latest: v12.0.1) or the project website.
Is Mattermost still maintained?
The repository's most recent commit was on Oct 27, 2026. appsgit only lists apps whose repository had a commit in the last six months.