zulip - About
Zulip is a 100% open-source team chat application designed to help people collaborate to solve any challenge. With conversations organized by topic, Zulip is ideal for both live and asynchronous communication.
To add contact info data to your profile here, you must add a link to a hcard to your webfinger. One example how you can do this is to join Webfan and join Fediverse City.
