Something I didn't see before, is that a bunch of open source communities seems to starting to use Zulip now as well. I've only seen it in a "remote software company" context before.

Here are some case studies from Zulip themselves about specific organizations, how they moved to Zulip and how they are using it:

- https://zulip.com/case-studies/rust/

- https://zulip.com/case-studies/asciidoctor/

- https://zulip.com/case-studies/lean/

I know a bunch of the Rust people hang around on HN, maybe they can fill out any details or tell more about how it's going so far with using Zulip :)