TortoiseSVN - The coolest interface to (Sub)version control
GitHub Desktop - GitHub Desktop is a seamless way to contribute to projects on GitHub and GitHub Enterprise.
VisualSVN - VisualSVN - Subversion plugin for Visual Studio
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.
Xversion - Super easy enterprise class version control.
gitti - Gitti is a Git Client for Mac OS X designed to help users never have to touch the command line.