Isn't Mattermost basically open source Slack?
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I’m not fully informed, but mattermost changed its license (still open source) and some aren’t recommending it anymore.
There's also Rocket Chat.
Both are decent enough self hosted solutions. That's why they also both advertise, being used in military, security, and defense.
The user experience in either of those isn't particularly great. Slack beats them with ease of use and like a million easy to use plugins.
Element (matrix)?
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Matrix UX is just bad in so many ways.
https://prose.org/ looks great, it even uses a standardised protocol. I've tried it and it works well, much better than Rocket.Chat, Zulip or Mattermost.