The Zulip core developers have decades of combined experience writing and maintaining free and open source software. We use Zulip to keep contributors engaged, efficiently make decisions, and fashion the day-to-day experience of being a part of our project. No other chat product comes close to Zulip in facilitating contributor engagement, making efficient use of maintainers' time, and upholding the values of the FOSS community.
If you haven't read why Zulip, read that first. We've also collected a list of features we think will be of particular interest for open source communities using Zulip.
Free hosting at zulipchat.com
No catch; the hosting is supported by (and is identical to) zulipchat.com's commercial offerings. This offer extends to any community involved in supporting free and open source software: development projects, foundations, meetups, hackathons, conference committees, and more. If you’re not sure whether your organization qualifies, send us an email at email@example.com.
Scale to thousands of users
For those running Zulip at home, we’ve done a lot of work to ensure that drive-by members of the community don’t consume too many disk or CPU resources. A Zulip server with 1000 active members and 10000 inactive members takes about as many resources as a Zulip server with 1000 active members.
Join without an invitation
Authenticate with GitHub
Allow (or require) users to authenticate with their GitHub account, instead of with their email address.
Quality data export
Our high quality export and import tools ensure you can always move from zulipchat.com hosting to your own servers.
Full Markdown support, including syntax highlighting, makes it easy to discuss code, paste an error message, or explain a complicated point. Full LaTeX support as well.
Permalink from issues to chat
Permalink to Zulip conversations from your issue tracker. Zulip’s topic-based threading keeps conversations coherent and organized.
Link from chat to issues
Efficiently refer to issues or code reviews with notation like
T1234. You can set up any regex as a
custom linkification filter for
Enforce a code of conduct
Link to your community norms or give other instructions right on your Zulip registration page. Admins can delete messages and deactivate (ban) users at any time.
Hundreds of integrations
Get events from GitHub, Travis CI, JIRA, and hundreds of other tools right in Zulip. Topics give each issue its own place for discussion.
Free and open source
Don’t like something? You can open an issue, submit a patch, fork the project, or chat with us directly at chat.zulip.org. All code, including the desktop and mobile apps, is under the Apache 2 license.
Check out chat.zulip.org to see Zulip in action for a project with ~5000 messages of developer discussion a week. The Zulip project is the largest and fastest-growing open source group chat product, both by number of contributors (300+) and by commit velocity (more than Docker and Django combined).
Public archive (coming soon)
Allow search engines to index your chat, with a read-only view of your public streams. Zulip’s topic-based threading keeps conversations coherent and organized, enabling a meaningful archive.