Market Interest Rates
The United States Federal Government website below is useful to view current interest rates and economic data.
Federal Reserve Statistical Release - Selected Interest Rates
The forecasting website below may be utilized to help understand future market interest rates and other important price trends and economic indicators.
Financial Forecast Center
The following website is for a software supplier that provides reliable products that will make financial calculations and amortization tables utilized for financial accounting purposes (includes lease calculator examples).
Financial Calculators from TimeValue