Self-hosted GitLab is what GNOME and Debian chose to do.

I still use the main GitLab for most things.

https://repo.or.cz/ provides just git hosting.

It's also relatively easy to just self-host Git, though permissions can be wonky, at least last time I tried.

I can't recommend Darcs. Luckily I don't see MS (or any other corp) being able to take over core Git development. I really should try Pijul again, but least time I played with it, the history/branch visualization (which you can do without, but I really like to have) was actually still worse than Darcs.