[cm3]

It's not fossil-scm, but git-appraise restores some of the lost distributed'ness:

https://github.com/google/git-appraise

https://github.com/google/git-appraise-web

https://github.com/Nemo157/git-appraise-rs

And there's also http://jk.ozlabs.org/projects/patchwork/ (http://patchwork.ozlabs.org/project/qemu-devel/list/).