Hey there,
I’m on the search for an alternative to Mattermost for a small institution I’m working with. Mattermost was the strongest contender for our needs, yet they changed their policy regarding self-hosted instances. The factor that killed it for us, is the hard cap on 250 registered users, as we potentially might need to commodate more than that.
Rocket.Chat has similar caps.
We found Zulip, and it seems as it might be what we are looking for, but we haven’t tested yet. Nonetheless, I wanted to address this community, as you may have another good idea?
Zulip is great, it’s very powerful and works well even when you rely on their hosting. The only issue I have with it is its ui could be better but its not something you can’t figure out. Search feature isn’t always the most reliable so that practise isn’t gonna work there.