GitHub Desktop - GitHub Desktop is a seamless way to contribute to projects on GitHub and GitHub Enterprise.
TortoiseSVN - The coolest interface to (Sub)version control
Git - Git is a free and open source version control system designed to handle everything from small to very large projects with speed and efficiency. It is easy to learn and lightweight with lighting fast performance that outclasses competitors.
SmartSVN - SmartSVN is a graphical client for the Open Source version control system Subversion (SVN).
Mercurial SCM - Mercurial is a free, distributed source control management tool.
Xversion - Super easy enterprise class version control.