The carousel on the main page is very easily understandable, which is great! The whole topics (sub-channels, basically) idea seems interesting as well, though personally the solution itself seems pretty similar to two other great pieces of software out there: - Rocket.Chat https://rocket.chat/ (the Jitsi integration was especially nice) - Mattermost https://mattermost.com/ (really simple to setup) Both of those also…
Threading feels bolted on in Mattermost, but is the primary feature of zulip.
Think of Zulip as a realtime version of NNTP, and Mattermost as a more modern IRC with a "reply" feature. The "right" way to use Zulip and Mattermost is quite different, though each one can be easily used as an inferior version of the other.