 <p>There is quite a list:</p> <ol> <li><a href="http://code.google.com/p/nstub/" rel="nofollow noreferrer">NStub</a></li> <li><a href="http://sourceforge.net/projects/testgennet/" rel="nofollow noreferrer">TestGen.Net</a></li> <li><a href="http://code.google.com/p/nunitgenaddin/" rel="nofollow noreferrer">NunitGenAddIn</a></li> <li>($$)<a href="http://www.kellermansoftware.com/p-30-nunit-test-generator.aspx?mode=Specifications&amp;" rel="nofollow noreferrer">KellerMan NUnit Test Generator</a></li> <li><a href="http://research.microsoft.com/en-us/projects/pex/" rel="nofollow noreferrer">Pex</a></li> <li><a href="http://msdn.microsoft.com/en-us/library/ms182524%28v=VS.80%29.aspx" rel="nofollow noreferrer">MSTest</a> - fair enough this is not NUnit, but it does generate tests and should be "considered"</li> </ol>