Wikipedia
VsTortoise
VsTortoise is a free-of-charge add-in for Microsoft Visual Studio 2005, 2008, 2010, 2012 and 2013 that provides an interface to perform the most common revision control operations directly from inside the Visual Studio IDE. It uses TortoiseSVN to execute the Subversion commands. It supports TortoiseSVN 1.6, 1.7 and 1.8.
As of January 2010, the author decided to make the project open source, and made it available on CodePlex.