Zulip - Powerful open source group chat

[andreasdueren]

As for Chat alternatives I'd by now recommend Matrix. I've been using it for a few years for personal communication and it's been a bit of a painful growth but can say that it's probably the best choice currently. I'ts free and I don't really see that changing since Element seems to have a good portion of paying customers and the new mobile apps are quite snappy. I've been test running them for a week or two and they feel super responsive and intuitive, very much like one would expect from a Telegram alternative.

NC Talk is great but really is more of a business solution.