We used Zulip for some time. Overall it's pretty good - the clients could really need a bit more love though. What I always found amazing was their support. No

We used Zulip for some time. Overall it's pretty good - the clients could really need a bit more love though. What I always found amazing was their support. No matter when I contacted them I got a response immediately and my issue was either taken care of or I got an explanation that it is intended to work this way.