Well, I don't know about the task of figuring out which program depends on what (maybe a cool regex task?), but I have a tip on the output part: have a look at GraphViz, and generate input for it (for the visualization part).

There is even a Perl interface to it: GraphViz, although I can not speak for that (never used it, always generated GraphViz input files directly).

Christian Lemburg
Brainbench MVP for Perl
http://www.brainbench.com