Zulip
Zulip is a full-featured F/OSS Slack alternative. With unique threaded chat, group discussion features, and an easy to use Desktop app, Zulip is great for teams of all shapes and sizes.
🚀 Project of the day: Zulip
Zulip: Open-source team chat with topic-based threading
Zulip is the only modern team chat app that is designed for both live and asynchronous conversations. Organized to help you collaborate productively and efficiently.
Zulip (code) is a robust chat solution with good performance, video, integrations and more. The stand-out feature of Zulip is it's awesome threading model.
Zulip has a desktop client that's quite easy on the eyes:
Zulip provides a fully F/OSS alternative to Slack and other closed-source chat applications, even including video calls.
For businesses, the Zulip team also runs a hosted option so make sure to check that out for your business as well!