There's a few, but not too many. See e.g. some package repos:

https://github.com/search?q=repo%3Afreebsd%2Ffreebsd-ports+%...

https://github.com/search?q=repo%3Avoid-linux%2Fvoid-package...

https://github.com/search?q=repo%3ANixOS%2Fnixpkgs+%22EUPL12...

Most of the software from the EU and some governments are also under EUPL, but those tend to be "source dumps" that no one really builds.