Codeberg is an organization that provides a Gitea instance for public use. I think their ToS only allows using their service for free software projects, but you should check that before doing anything with this info.
Gitea is an open source code forge. It is very similar to Github, both by the looks, and because it uses a build automation system (almost?) totally compatible with Github actions. It also has a quite unique feature, repo migrations, that can periodically “import” the git repo, and platform specific things like issues, MRs, releases and such too but only on the initial migration currently. Some use the periodic part for archiving git repos from elsewhere that they have found useful.