[Navarr]

I played with it a little bit once for a small personal project. It seems to have all the features you want, but the way you used them never really clicked with me.

Unlike Stash, GitLab, GitHub, Gogs, or others of that nature - though - it expects you to setup your git repositories elsewhere (at least the last time I used it) instead of acting as a receiving host for them (at least the last time I used it - which was a year or two ago at this point).

[epriest]

This has changed; we've supported hosted repositories since late 2013.

[SEJeff]

Phabricator does host git repositories. The workflow is a bit strange when compared to github's more natural PR model, but it works, and is overall quite solid.

Bonus points that in encourages you to upload memes under macros to troll your coworkers when doing code reviews.