TortoiseSVN 1.8.11
Category: Developer
Short Description: TortoiseSVN is a really easy to use Revision control / version control / source control software for Windows. It is based on Subversion. TortoiseSVN provides a nice and easy user interface for Subversion.
Details: It is developed under the GPL. Which means it is completely free, including the source code. But just in case you dont know the GPL too well: you can use TortoiseSVN to develop commercial applications or just use it in your company without any restrictions.
Since its not an integration for a specific IDE like Visual Studio, Eclipse or others, you can use it with whatever development tools you like.