Specter is an object-behaviour specification framework

It enables behavior driven development (BDD) by allowing developers to write executable specifications for their objects, before actually implementing them.
Technologically this is similar to test driven development (TDD), however the shift in nomenclature removes the psychological barrier of writing "tests" for code that does not exist.

Specter makes use of Boo meta-programming capabilities to provide an easy and readable syntax for writing specifications.

Features
Readable specification code example
Specifications can be compiled even if the objects specified (the subjects) are not implemented yet
Standalone specification runners
Integration with existing NUnit tools