Zulip
Open source team chat with first class threading.
Zulip launched on December 27, 2017 with 173 votes, #156 of 2,482 launches that month and more than 90% of that year's launches. The site was still online in September 2026, 8 years on.
What it does
Zulip is a powerful, open source group chat application that combines the immediacy of real-time chat with the productivity benefits of threaded conversations.
Zulip is an organized team chat app for distributed teams of all sizes.
Escape corporate vendor lock-in. You can self-host Zulip’s 100% open-source software for full data sovereignty, or start with a convenient cloud solution and move any time. We make it easy to switch from Slack , Teams and other toolsfrom zulip.com
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