csUnit

csUnit is a free and open source unit testing tool for the .NET Framework. Unit testing is tightly associated with test-driven development (TDD), refactoring, and other practices from agile software development approaches such as Extreme Programming or Scrum.

Main Features:
- Standard unit testing features such as test, fixture, setup, teardown, ignore, expected exception, etc.
- Easy to use graphical user interface
- Recipes for combining several test assemblies into one test suite
- Addin for Visual Studio 2005 and Visual Studio 2008
- Search capabilites across tests, output, and statistics
- Statistics per test to create performance base line
- Categories to group tests for execution
- Support for applications targeting .NET 2.0, .NET 3.0, and .NET 3.5
- Works with any .NET language (C#, VB.NET, Managed C , etc.)
- Runs on Windows Vista SP 1 or Windows XP SP 3