Gitea - A painless self-hosted Git service
GitKraken - The intuitive, fast, and beautiful cross-platform Git client.
GitBucket - GitBucket is the easily installable open-source GitHub clone written with Scala.
SourceTree - Mac and Windows client for Mercurial and Git.
Bonobo Git Server - Set up your own self hosted git server on IIS for Windows.
GitHub Desktop - GitHub Desktop is a seamless way to contribute to projects on GitHub and GitHub Enterprise.