TortoiseSVN - The coolest interface to (Sub)version control
GitKraken - The intuitive, fast, and beautiful cross-platform Git client.
Xversion - Super easy enterprise class version control.
SourceTree - Mac and Windows client for Mercurial and Git.
RapidSVN - CollabNet, Facilitating Collaborative Software Development
GitHub Desktop - GitHub Desktop is a seamless way to contribute to projects on GitHub and GitHub Enterprise.