Sadly JFCUnit is no longer supported but idea is neat and with a few more improvements it can be even more useful tool for regression testing.
JFCUnit-2 will have distributed testing, SWT support, JUnit independent and lots of other improvements.
STDL (Structured test description language) is a domain-specific testing language that is used to auto-generate unit test code. It supports a myriad of output languages (incl. C#). The project's aim is that of reducing the resources required for testing