I want to create an application similar to the Visual Thesaurus but
instead of words and their synonyms, I have a database of items in my
industry and want to map all the relationships between those items and
drill down. I have been told that there is source code available for
producing this kind of display but so far, my searches have turned up
very little.

Does anyone know where I can get source that I can adapt to my
environment that will produce this type of display?

Thank you,