1)   Free Pay Down Debt or Invest Calculator 4.0
This free financial calculator helps you determine whether paying down your debt or investing a windfall is the better choice for you.

 2)   Pay Down Debt or Invest Calculator 2.0.03
This free financial calculator for Windows helps you determine whether paying off debt or investing is your best option when you have a windfall.

 3)   Mortgage Prelude 2.3.1
This FREE mortgage calculator computes such items as your monthly payment, amortization schedules, interest, etc; but it is so much more. You can actually find out how much of a mortgage you are qualified to get!