
augment.rubyforge.org
AugmentAugment is a system for gathering metadata from code and displaying it. This metadata will include test failures, test coverage levels, complexity metrics, and others. The display frontends are pluggable so as to interface with many editors and environments. To play around with it. As you can see, that's a short list. If you'd like to implement augment support for your editor, it's pretty easy. See the writing a frontend guide. Augment works by running a set of backends. Hop on the mailing list.
http://augment.rubyforge.org/