Class diagrams of Selenium Source code.
Going to be a selenium committer ?
I am sure this might be help ful for you to get a sneak- peak of huge set of source codes.
There are more than 4000+ Java class diagrams generated here
Small description about the software, AgileJ is a reverse engineering tool comes as a Eclipse IDE plugin, where in we can generate the class diagrams from the source codes.Specially when there is no any source code documentation.
AFAIK, I am sure these class diagrams are generated few months ago and its obvious it will miss the latest.
Hope this helps!!!