Mattermost is an open-source, self-hostable online chat service with file sharing, search, and integrations. It is designed as an internal chat for organisations and companies, and mostly markets itself as an open-source alternative to Slack and Microsoft Teams. The code was originally proprietary, as Mattermost was used as an internal chat tool inside SpinPunch, a game developer studio, but was later open-sourced. The 1.0 was released on October 2, 2015. The project is maintained and developed by Mattermost Inc. The company generates funds by selling support services and additional features that aren't in the open-source edition. More information...
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