SourceTree - Mac and Windows client for Mercurial and Git.
SubGit - SubGit is a tool for a smooth, stress-free SVN to Git migration.
SmartGit - SmartGit is a front-end for the distributed version control system Git and runs on Windows, Mac OS...
BitBucket - Bitbucket is a free code hosting site for Mercurial and Git. Manage your development with a hosted wiki, issue tracker and source code.
GitTouch - Open-source app for GitHub, GitLab, Bitbucket, Gitea, and Gitee
MacHg - MacHg is a free open source OSX GUI for the revision control system Mercurial.