I've mentioned my unit test library before (http://arclanguage.org/item?id=17922), but now I think it's pretty much ready for prime time. It reports results nicely (if verbosely), and you can run decent subsets of your tests. It even has a README!
I'd love to hear feedback, whether on this forum or by submitting a bug (https://bitbucket.org/zck/unit-test.arc/issues/new). This is a weird thing, but as I'm doing this project for Lisp In Summer Projects (http://lispinsummerprojects.org/), I'm supposed to do pretty much all the work myself. I'd love to take patches after the contest closes.
Lisp In Summer Projects hasn't made a list available that I know of. Certainly they will announce the winners; I don't know if they'll announce all the projects. Hopefully.