MS Visual Studio-based support for unit, automation and load tests as well as measuring coverage [Commercial, trial version]

A framework, based on the JUnit family, for building application unit tests. It assists with test-driven design, a technique of Extreme Programming. By Philip Craig.

Advanced, extensible and generative framework that allows you to test various aspects of your .NET software [Open source, zlib/libpng license]

An open, extensible, and neutral system for .NET that provides a common object model, runtime services and tools that may be leveraged by other test frameworks. Includes download, samples, tutorials and FAQ [Open Source]

C# based unit testing framework for the .NET framework. Includes download, samples, tutorials and FAQ. [Open source, zlib/libpng license]

An implementation of Kent Beck's XUnit testing framework designed specifically for unit testing components written for the .NET platform. [LGPL]

Unit- and Integration testing for the .NET platform.

A coverage profiler for GUI applications. It measures coverage of application tests and allows to find untested elements. [Commercial, trial version]