Element/Matrix is pretty much what you're looking for if you need self hosted. Could also look into Jabber/XMPP or IRC but Matrix is going to be way more modern and useable.
this post was submitted on 17 Nov 2023
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Zulip
I found Zulip to be much more intuitive than Slack.
Mattermost
I think Rocketchat is what you're looking for.
I'm forced to use slack for work and I fuckin hate it
Could be worse, you could be forced to use teams!
Slack UI just KEEPS getting worse. FML.