VisualSVN Server - Get an easy to use Subversion (SVN) server for Windows. It works out-of-the-box and is suitable both for small business and enterprises. Available for free!

Xversion - Super easy enterprise class version control.

Subversion Edge - What is Subversion Edge? A certified software stack containing the latest versions

TortoiseSVN - The coolest interface to (Sub)version control

VisualSVN - VisualSVN - Subversion plugin for Visual Studio

GitHub - Originally founded as a project to simplify sharing code, GitHub has grown into an application used by over a million people to store over two million code repositories, making GitHub the largest code host in the world.