Comment by NewJazz

You can self host the software underlying Codeberg, which is Forgejo. Then there is also GitLab which has a lot more features but is arguably more intensive to maintain. And then there is the long tail, such as the projects Forgejo was forged from (Gitea and Gogs) and various other FOSS forges e.g. Phorge which was forked from the now discontinued Phabricator.