Pypants (Django Dash 2009)
pypants.org
pypants.org
It only works for python packages currently. You can point it at any git repository that has a python package in it (watch the screencast).
Number of lines of code? Size of methods? Number of commits? How much you like them?
An about page with the grading methodology should probably be the next thing you publish. Also, in my mind the historical breakdown is irrelevant. I couldn't care less if the project sucked two weeks ago if they re-factored and are now "a" quality. Of course, that's if I knew what "A" quality meant. :-)
Other than that, not a bad effort for a dash project. It's a neat idea and something that could prove very useful.