There is mostly functional git remote - https://github.com/ipfs-shipyard/git-remote-ipld - It's still missing "full" remote tracking with IPNS, that will get implemented soon after next go-ipfs release, so it's a bit weird to use now
Git portal is also taking shape: https://igis.io/ (also accessible via any gateway - https://cloudflare-ipfs.com/ipns/igis.io/). Git repo is at https://github.com/ipfs-shipyard/IGiS (Dynamic features like pull-requests are hard).
Edit: formatting