active live #GitViaNostr projects: gitworkshop.dev, ngit, gitstr, patch34 (?), song. There is also experimentation such as https://github.com/lez/git-remote-blossom, and https://github.com/gugabfigueiredo/git-remote-nostr 
other interesting active decentralised git projects: radicle
there are self-hosted centralised git server projects: gitlab, forgejo, gitea. I didn't realise gogs was active, i thought it had died but apparently not.
there are hosted versions of some of these: codeberg (gitea/forgejo), gitea (hosts gitea instance), etc.
there is sourcehut which is good for hosting projects that use patches over email.