I was looking for a scientific calculator for my Axim X3 and I stumbled upon Eval (I think I was reading a slashdot article for “Programmers at work” at the time). Eval is written by Jonathan Sachs. Not only is it a fine freeware solution that transforms your Pocket PC into a scientific calculator, but there is also a Windows version available (To be able to use the help file you have to install the WinHlp32.exe update. I do not know for Windows 7 and higher).
Eval
Published
Managing organized complexity 