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What's mattermost? People in the GitHub comments say "I just need messages" but there's lots of self hosted messaging apps/servers, no? XMPP comes to mind immediately.


It’s an IRC-like, group chat for Corporate that works in airgap. When HipChat was obsoleted, then Mattermost took over.


It's an open source alternative to Slack


Well, it was this at the beginning. Now it’s an open-core competitor to Slack, with higher pricing(!) but you can use the free version that has fewer features.


My employer migrated to it from IRC, for example.




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