ReSharper is a productivity extension to Visual Studio that helps maintain and improve C#, VB.NET, ASP.NET, ASP.NET MVC, XAML, XML, HTML, JavaScript, or CSS code in Visual Studio projects. It detects and removes errors and code smells; speeds up coding; provides rich navigation and search features, 40+ solution-wide refactorings and hundreds of code transformations, as well as many more great features for .NET developers.
http://www.jetbrains.com/
