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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.

Rated 4.0 out of 5

On the website there are different models/packages on sale:

However the software is open-source and can be hosted on your own server, for example on a Debian system: – therefore this software can be considered as trade-free.

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