The source code used to be split between the Whoola and the Xith CVS repositories. All of the code is now at the Whoola CVS repository. You can access the code and the demos here: http://whoola.sourceforge.net/
The code provides a COLLADA and Google Earth loader for Xith, an Open Source Java scenegraph API and renderer. I am thinking of creating a loader for the Java3D API reference implementation as well. https://java3d.dev.java.net/
I want to add import/export of COLLADA format to our 3D java library jReality (http://www.jreality.de). I guess I should start converting the xith-tk code, or would you suggest a different starting point? Our code is available under a BSD license, does that conflict with your license(s)?