QuikCalc Amortization Professional Ed. 

Mortgage and loan software includes the powerful Amortization Schedules Plus! feature that allows you to override, skip or add any number of payments. Also allows actual loan and payment tracking as well as payment projection. Includes many reports.
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Mortgage Wizard Plus 

Calculate US, Canadian and foreign loans. Very intuitive. Does late payments, lumpsum payments, changed payments, interest changes, etc. Use 360-day and Exact day factor methods. Crush your US or Cdn mortgage sooner and save on cumulative interest.
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Loan Advisor 

Loan Advisor allows you to analyze and optimize your loan. Learn how to pay off your loan sooner & save money at the same time. View detailed schedules showing a breakdown of your loan over time, and perform "What if" and residual value calculations.
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