Zulip 9.0, an open-source threaded team chat app, introduces a UI redesign, improved message composition, faster navigation, and renames streams to channels. It also supports Ubuntu 24.04 and is developing a new mobile app using Flutter.
https://alternativeto.net/news/2024/7/zulip-9-0-released-with-ui-overhaul-enhanced-features-and-new-mobile-app-in-development/