Gitea - A painless self-hosted Git service
Git-Repo - Manage Gitlab, GitHub and Bitbucket from the command line
GitBucket - GitBucket is the easily installable open-source GitHub clone written with Scala.
Diff So Fancy - Make Git diffs look good
Bonobo Git Server - Set up your own self hosted git server on IIS for Windows.
Gitential - Analytics for Git Repositories