We run Gitea at my company. In fact, we forked it. It could reeeaaaalllly use a rewrite. If anyone is even mildly ambitious about creating a new alternative to Github/Gitea, it's a great time to do that.
Another self-hosted project in the space that i've seen was GitBucket, although it runs on the JVM (not necessarily a bad thing, just different from Go): https://gitbucket.github.io/