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?
There is also Nextcloud Talk, but it can be a bit overwhelming to set up (needs the high-performance backend for video and stuff). But, it’s entirely self-hosted and has no user cap as far as I am aware.
I’m not sure what the performance would look like for hundreds of users