After stumbling across the
websites as graphs blog entry at
aharef.info, I was fascinated by the simplicity and beauty of this visualization algorithm.
Immediatly I took the code of the underlying Java
applet and built a small Swing GUI which embeds this particle engine.

The frame is resizable and images can be saved.
I will make the sources available in some days, after fixing some bugs.
Eventually I will spend more time in it, because the underlying potential is big. One can think of visualizing arbitrary XML structures or other tree-like information. I also started using it for visualization of link structures in web sites.