SourceTree - Mac and Windows client for Mercurial and Git.
Gitea - A painless self-hosted Git service
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
Gitstack - GitStack is a free software that let you setup your own private Git server on Windows.