Some other interesting tools in the space. Rust is using a tool called Josh to sync commits:
The blog post from the Rust people:
https://blog.rust-lang.org/inside-rust/2026/06/04/how-josh-h...
Meta used to have an open source tool called fbshipit. But according to its open source repo they no longer use it:
https://github.com/facebookarchive/fbshipit
Any others in this space?
git subtree was the OG tool: https://apenwarr.ca/log/20090430
It has since been merged into git proper:
https://manpages.debian.org/testing/git-man/git-subtree.1.en...
https://docs.github.com/en/get-started/using-git/about-git-s...
Yeah I vibe coded https://github.com/sluongng/capyfun during a hackathon recently to add a generative transformation layer on top of the traditional imperative transformations.