CalcSupreme
CalcSupreme, an RPN calculator emulation and much more, encompasses a wide range of fundamental and sophisticated basic, financial, math/science, and logic operations, accessible respectively via 4 different screens. Basic operations include arithmetic, algebraic functions, data manipulations,... Business/finance includes loan/savings, cash-flow, bond, discount, markup, depreciation, calendar, and miscellaneous calculations. ... Also, you can exchange data between CalcSupreme and a spreadsheet or other program by use of menu items Cut, Copy, and Paste.
http://www.syringasoftware.com/download/CalcS_inst.exe - 5Mb - Download - Screenshot