I have been playing with this idea of a JJ native code collaboration platform in the style of Github/Gitlab/Etc.
JJHub is an attempt at that, it stores change ids, manifests of each version's full tree and content addressed blobs. This means that it is agnostic to the backend JJ is using, be that native or git.
The UI is also focused towards what makes JJ good, conflicts being first class citizens, stacks and graphs and incremental reviews of what you are working on.
Its not feature complete but I think it is ready for a trial run if anyone is interested, there is an invite limit just to avoid me blowing out my hosting costs, either sign up using the code or click the link
jjh_inv_ENae96qwhwrTjFQQgwRhDsaX
https://jjhub.dev/invite/jjh_inv_ENae96qwhwrTjFQQgwRhDsaX
Feel free to leave feedback using the feedback link in the footer.
The CLI is open source under MIT on jjhub and currently tracks jj 0.45 on Linux and macOS. The server is closed source for now but there are plans to allow self-hosting in the future.
You can read more about what makes jjhub here: https://jjhub.dev/what-is-jjhub