We've been building Twigg for quite a while now and open sourced all of it.
Its goal is to provide a similar developer experience to the Google/Meta/Phabricator one.
The project consists of not only the version control (the "Git" analogous) but also the software forge (the "GitHub" analogous) and the CI/CD server (the "GitHub actions" analogous).
You can self host it or use our hosted instance (https://twigg.vc).
Come check it out, and leave us a star on GitHub!
Show HN: Twigg – open-source big-tech-like version control and software forge
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