What is Mattermost?
Mattermost is an open-source, self-hostable Slack alternative built for organizations that need control over their data. Channels, playbooks and integrations mirror commercial team chat while keeping everything on your own infrastructure.
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Mattermost was added to the directory on Jul 7, 2026 and this page was last updated Jul 7, 2026. Spotted something wrong or missing? Contribute to this page.