VisualSVN is an Apache Subversion integration plug-in for Microsoft Visual Studio. It is implemented as a low-level Visual Studio Integration Package and provides the complete, robust and straight-out integration with Subversion.
Visual Assist is a plug-in for Microsoft Visual Studio developed by Whole Tomato Software. The plug-in primarily enhances IntelliSense and syntax highlighting. It also enhances code suggestions, provides refactoring commands, and includes spell checking support for comments. It can also detect basic syntax mistakes such as use of undeclared variables.