I've been using git spice (https://abhinav.github.io/git-spice/ https://abhinav.github.io/git-spice/) for the stacked PRs part of graphite and it's been working

I've been using git spice (https://abhinav.github.io/git-spice/ https://abhinav.github.io/git-spice/) for the stacked PRs part of graphite and it's been working pretty well and it's open source and free.