TestDriven.NET - Unit-Testing add-in for Visual Studio .NET fully integrated with all major unit testing frameworks including NUnit, MbUnit, csUnit and Visual Studio Team System. RADvolution Designer - An integrated RAD tool for Visual Studio.NET with drag&drop layout engine technology, control naming convention and .NET components and controls. Allows fast design of forms and applications. By DevelopGuidance. StudioSpell - Spell checker Add-In for Microsoft Visual Studio .NET checking web-page Html and strings in source code. FeinSoftware - Providing development tools for Microsoft Visual Studios. Visual Paradigm SDE for Visual Studio - Allows generate .NET source code from UML model directly, or reverse engineer existing code into the model for further enhancement. Visual Studio Express - Free, but limited editions of Visual Studio for individual programming languages supported by .NET and SQL.