Git is a popular source revision control system. GitForce is a GUI front-end for the git command line tool and runs on both Windows and Linux. It is designed to be easy and intuitive to use and yet powerful enough so you don't need to use a command line git.
An open-source FPC LCL based GUI utility for version control tools (like SVN). It's inspired by Borland Team Source for the easy of use and simple interface.
as well as provides the latest features available with modern version control tools.