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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VehiCalc Car Loan/Lease Analyzer Home Ed 

VehiCalc Car Loan/Lease Analyzer allows you to quickly calculate lease and loan payments as well as compare the true overall cost of owning versus leasing. This will allow you to determine whether leasing truly is the better option.
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