Zulip is the best chat/asynchronous communication tool that I have tried so far. It is not perfect, but for an organization with many members and generating hundreds of messages per day, it is the best option to keep things organized.We have been using Zulip at our institution only for ~1 month, but despite the inertia to change from previously used tools, we are now ~60 members, with more than ~4500 messages, and most people seem to be very happy with the change and not looking back.

+ open source (https://github.com/zulip)+ Cloud Standard Plan free for Research (https://zulip.com/plans/) + messages do not get deleted after a certain period of time.+ Unique topics feature that helps keeping conversations together (invaluable when a large number of members and conversations. Much better than threads in Slack/Discord/etc).+ Several interfaces: Web, Desktop (Mac, Linux, Windows), Mobile (ios, Android)+ strong and very active developing community https://zulip.com/development-community/+ rich formatting of messages: https://zulip.com/help/format-your-message-using-markdown+ integration and bots: https://zulip.com/integrations/

+ Mobile app not too polished yet + Not easy to create sub-organizations at the moment (but the Team is working on that)

I really love the way Zulip organizes conversations into named topics. It relieves a lot of stress to know that even after a vacation or some time working on a different project, I can always quickly and easily catch up on everything that's been going on. No other chat application offers such a great conversation model.Zulip is also open source and offers both self-hosting and cloud hosting, including free hosting plans for open source and academic projects.

The phone app can only log into one organization at a time, but this is not a big problem for me, since I don't enable mobile notifications, but .

Zulip is a good software , I liked the chat feature and controls/restrictions we can add for the specific users.

Not as such , most of the things are good

Our main use of Zulip is to have forums of discussions for each subject and also for collaborating between the faculty members and between students. It's a more lively environment than that of the forum in Moodle.

It's really nice to have streams (channels) for each subject/research groups/student groups; each stream is self-administered by the teachers or by the students themselves. I also like the organization in Topics inside each stream and the possibility to focus in just one topic. It's handy to be able to direct message with a group of others users. Being a CS department it's handy to have syntax highlighting (as I write this review I discovered code playgrounds!)

I'd like to have the possibility to use topics inside Direct Messages; it'd be nice to have separate conversations in parallel with some other person(s) having the ability to focus on this or that topic.

Best communication tool to run my research group. Highly recommended to all (small and big) labs in computer science, machine learning and AI.

Zulip offers the most logical and practical way to arrange threads and conversations into semantic streams. It offers the perfect integration with LaTeX which is fundamental to write math and hence to support scientific discussion in my team.

Zulip on the smartphone is still not as polished as the web or desktop app. It would be great to have the same fluid interface at your thumb disposal.