CoTestive is a new testing framework. At the time of this posting, it is in its very early stages; about 90% NUnit compatible. It's goals are to be:

1. NUnit & MbUnit compliant
2. FIT compliant
3. Extensible

In essence, it is slated to be comprehensive - a single testing framework that is developer-friendly, customer friendly, and extensible to suit the changing needs of the industry.