Check out Prefuse: http://prefuse.org/ http://prefuse.org/ It's in Java and a really solid library. For the web, there's Prefuse Flare: http://flare.prefuse

Check out Prefuse: http://prefuse.org/ http://prefuse.org/ It's in Java and a really solid library. For the web, there's Prefuse Flare: http://flare.prefuse.org/ http://flare.prefuse.org/ which is an ActionScript 3 port (so, basically programmatic Flash) that also works really well. I use Flare a lot and it's great; AS3 hasn't been that hard to learn. It's all very well documented and there are tutorials available (and a good user community). Example gallery using Prefuse: http://prefuse.org/gallery/ http://prefuse.org/gallery/