1)   NTest 1.0
An automated unit testing tool for .NET that generates test scenarios automatically with random input values and runs them to test the robustness of your program.

 2)   NUnit Test Generator 1.18
Does the quality of your code matter? If it does, then you simply have to try the NUnit Test Generator. The NUnit Test Generator works with NUnit, MbUnit, xUnit to make your life easier. Increase your code coverage. Prevent tomorrow's bugs today.

 3)   NUnit Cheat Sheet 1.0
Free NUnit Cheat Sheet that contains example code in C# that shows exactly how to create NUnit tests. Single page to hang on your cube wall.

 4)   Kellerman Gold Suite 1.0
Premier Suite of .NET Components including FTP, Encryption, Logging, Test Generation, Access Database Comparison, and Wizard Control for WinForms.