NDepend - NDepend is a Visual Studio tool to manage complex .NET code and achieve high code quality.
CodeRush - DevExpress CodeRush for Roslyn uses significantly less memory, works faster, and lets you start Visual Studio faster.
ReSharper C++ - ReSharper provides on-the-fly code analysis and eliminates errors in C#, VB.NET, XAML, ASP.NET, and XML
Prepack - Prepack is a partial evaluator for JavaScript.
ReSharper - ReSharper is a productivity tool for visual studio that provides tools and features to help you manage your code.
TestDriven.NET - TestDriven.Net makes it easy to run unit tests with a single click, anywhere in your Visual Studio...