GitKraken - The intuitive, fast, and beautiful cross-platform Git client.
TortoiseSVN - The coolest interface to (Sub)version control
SourceTree - Mac and Windows client for Mercurial and Git.
WebSVN - Online subversion repository browser
SmartGit - SmartGit is a front-end for the distributed version control system Git and runs on Windows, Mac OS...
Xversion - Super easy enterprise class version control.