forgejo [1] works well for me. It can be self-hosted, otherwise e.g Codeberg [2] runs a good instance [2]

[1] https://forgejo.org/ [2] https://codeberg.org/

https://tangled.sh?

social features via atprotocol, native jujutsu support, stacked PRs, interdiffs, light weight to selfhost, nix-based CI.

Gitlab of course. It's mature.