Are you looking for Dr Paul Brewer's Unofficial HAMP Loan Modification Calculator
Version 2.5-beta has Tier 1 and Tier 2, principal reduction, lender's variation, and misc expenses and was released October 2012
We also have a Historical Database of Loan Modifications or "Loan Mod Spy", fed with public data on over 4.5 million loan modifications as released by Treasury in Feb 2013.
There's also a YouTube Video featuring the unofficial calculator
If so, just click on that link. Please understand that, for many reasons, there is no warranty for the software or the calculations. Still, it is there to play with, study, learn something, and enjoy.
Y'all come back now