Basic Repayment Calculator
A repayment calculator that shows the estimated repayments based upon different payment options, loan amounts and interest rates.
http://www.collins-securities.com.au/calculators/calculators.asp

Extra Loan Repayment Calculator
Shows the effects of additional payments and putting your salary into your home loan. Results show a graph as well as detailed month by month numbers to use as a guide.
http://www.wizard.com.au/calculators/repayments/default.asp

Interest Savings Calculator
Compares monthly payments and interest costs of home mortgages of various loan term lengths.
http://www.homeloan-sydney.com.au/calc_compareloans.htm