Email yourself an
amortization
schedule -- use this program to send yourself a "desired"
monthly payment if you want to pay your house off early, or are a first
time home buyer

Prepayment
calculator - UPDATED Take your current balance and
look at your loan reduction. Does biweekly mortgages too. This
calculator allows you to see how prepaying your mortgage reduces
the length of your mortgage by putting in the current values for
your loan.

15.

Mortgage/Loan
Duration - Calculate how long a loan will last with a set
payment, or find how much to pay to end your loan at a certain
time period.