There is only XUL is a statichtml-based lightly currated index of all known (and so far added cause time) XUL and Beyond Mozilla-based efforts around the globe.
Frankly, the general Mozillasphere is fractured to hell and one needs a map to follow it it all. Hopefully, if projects can better co-exist on a single web page they might co-exist better everywhere? We'll go with that.
Featured are the main index of applications, platforms, and projects and links to related resources.
Yes, that is why I moved it to github so all can contribute and maintain this resource without it being completely up to me and any biases I may have.
By standard git flow. Fork, commit, pr, merge. Funny how simple that can work and well for the right application!