We have some pretty powerful in-hourse tools for visualizing information flow within a given worksheet. It will overlay borders around contiguous blocks of identical (R1C1) formulas and color code based on whether the cell has a value, a formula an off-sheet formula and cross-file formula, etc...

However, where our tools fail, and where your tool really shines is transforming the spreadsheet visual paradigm into something that more closely resembles the intent of the model. Very cool! (I signed up)