GVfs - Git Virtual File System (by Microsoft)
SourceTree - Mac and Windows client for Mercurial and Git.
Gitential - Analytics for Git Repositories
SmartGit - SmartGit is a front-end for the distributed version control system Git and runs on Windows, Mac OS...
GitStats - A local GitHub-like contributions calendar
GitHub Desktop - GitHub Desktop is a seamless way to contribute to projects on GitHub and GitHub Enterprise.