The Javadoc-generated API of the javaGeom project has been published on its web-site:
http://geom-java.sourceforge.net/api/index.html
This will help potential programers to understand the structure of the code.
Please not that the wiki pages are open:
http://geom-java.wiki.sourceforge.net/
Even if it is quite light at the moment, it is updated more frequently that the web page.
For any questions, the forum is open.
DL.