Crap4j uses Subversion for it's source repository.
The repository is currently broken up into a couple of different projects.
Crap4j core, and the eclipse plugin are under either Trunk, Tags, or Branches. Trunk contains the HEAD version of development.
The website is under the crap4jsite module. The benchmark, or Crap-o-rama web app is under benchmark. We have some miscellaneous stuff under misc oddly enough.
If you want to develop on crap4j, point your Subversion client at
svn co http://svn.crap4j.org/crap4j/trunk crap4j.
This will create a local directory with the crap4j sources.
