Zulip is a powerful, open source group chat application that combines the immediacy of real-time chat with the productivity benefits of threaded conversations.
The fully threaded model of Zulip allows you to follow conversations that you care about and ignore the ones you don't.Cons:
Nothing I can think about. It's insanely great :)
Zulip is built by keeping productivity in mind. Each conversation in Zulip has a topic. This allows you to take part in more than one conversation at the same time. This also make catching up on conversations efficient as compared to cSlack, Mattermost etc where you have to scroll through hundreds or thousands of messages to figure out what is going on. Zulip is the most active open source chat application in GitHub and has 350+ contributors from all across the world.Vishnu Ks has used this product for one year.
Free for open source projects
Separate Conversation Threads/topics
Great user support
Great chat search
Wait.... let me think....
Zulip is a fast and powerful group chat application with many unique features and more than 60 integrations. Above all it's an open source project makes it even better, as you can directly contact the developers about the issue you face, features you're missing or want to be improved and even file them at github.com/zulip/zulip/issues.Shubham Dhama has used this product for one year.