@mdiluz Thank you for this valuable thread!
For what it’s worth… I have been lurking on Zulip after being introduced to it through the @CoMaps project. I have been really impressed with the quality of discussion (credit to the contributors!) and how the tool helps keep the conversations organized (threaded). I’m now testing Zulip for another nonprofit I’m involved with. I think as chat for that specific use case — mission-driven, distributed, goal-oriented collaboration — it’s a pretty great solution. Much more accessible to me than, say, Slack or Discord, which hurt my head. 
️ I also like how Zulip lets you “resolve” threads like issues — so you can note when a discussion is over. (Threads don’t linger forever!) 