Gerrit is a git server that provides
code review and access control on git repositories
Gerrit Source Code
Unfortunately written in Java. Hopefully a new Jerrit written in Go will emerge in the future.
It's less overkill and more focused than Gitlab for projects that only need basic collaboration and access control.
Server run by the main developers of the project It is not focused on any particular niche interest - everyone is welcome as long as you follow our code of conduct!