Family Tree layout of Data

Are there any modules out there to display data in a format similar to the way a family tree gets displayed? I'm trying to write a CGI app that will supply a module of some sort (could be javascript, Perl, Java, etc..,) data which it will then display like a family tree. I have objects with certain charateristics I want to display in individual blocks (equivalent to individuals in a family tree) and these same objects may have child objects which will go beneath the parent. Anyone familar with any modules out there that can help create something like this? I would prefer it to be generated HTML but it could also be a generated image, etc..,. Any help would be greatly appreciated. Thanks.

very dynamic JavaScript one is http://thejit.org/

I do not know of anything else.

Eric

Thanks Eric. I was hoping to get something HTML generated but would settle on something similar to JFreeChart if available. Something you pass the values in and generate an image.