Gitea - A painless self-hosted Git service
SourceTree - Mac and Windows client for Mercurial and Git.
GitBucket - GitBucket is the easily installable open-source GitHub clone written with Scala.
GitKraken - The intuitive, fast, and beautiful cross-platform Git client.
Bonobo Git Server - Set up your own self hosted git server on IIS for Windows.
GitLab - Create, review and deploy code together with GitLab open source git repo management software | GitLab