@lewiscowles1986@phpc.social Well, it's easy - because both Gitea and Gogs follow the GitHub's approach. They take a VCS tool and build a project management & collaboration tool around it. You already said that's not what you want ;) The approach you described used to be popular in FLOSS about 20 years ago (with projects commonly deploying single-concern tools like Bugzilla, Trac, Jenkins, gitweb, Patchwork etc.), but these days it appears to be used just by a minority of long-standing projects.
@lewiscowles1986@phpc.social I guess SourceHut is as close as it gets to be a modern take on such approach, since while it's a suite of various tools for various purposes you should be able to easily mix'n'match them or deploy in parts (e.g. git.sr.ht is analogous to gitweb and only becomes a project management tool when combined with lists.sr.ht and todo.sr.ht)