Calculator.org have a free scientific, engineering, statistical and financial calculator for PocketPC.
The developers of Calc98 have made the Pocket PC version of their calculator software available for download and use free of charge from Calculator.org.
Calc98 includes a vast range of units conversions, fundamental constants and physical property data, and other features including arbitrary base numbers, Roman numerals and a stopwatch feature and built-in Periodic Table of the Elements. The features stack up so that Calc98 can be used as a handy pocket reference. The software also runs on desktop versions of Windows.
The site has won many awards, including a StudyWeb Academic Excellence Award, and the software (in its Windows incarnation) was a winner in the 1998 Shareware Industry Awards.
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