SMath Studio is a math program with "paper"-like interface. It has an ability to work with systems, matrices, vectors, complex numbers, infinities and fractions
BlueCalc - a powerful expression calculator and formula processor useful for doctors, businessmen, scientists, students and everyday use. It looks good and is easy to use. Hidden in the background there is a strong interpreter that can immediately process any mathematical operation and complex expression
Pocket Life -Conway's Game of Life (aka "Life") is a mathematical toy which was discovered in 1970 and has been ported to almost every single kind of computer since then. I could not find a version for the Pocket PC, so I wrote one myself
SMath Studio - Traditionally, since the appearance of the first programs, their speed and available features are ever increasing, while user interfaces are getting more and more complicated. As a result, the non-professional users are unable to deal with these overcomplicated features
Balance Keeper is an educational tool that helps children practice addition, subtraction, logical thinking, and basic algebra. The purpose of the game is to balance the scale by clicking and dragging weights. Complex problems consist of unknown mystery weights. Through deductive reasoning and trial and error techniques, a child can determine these unmarked weights
RealCalculator includes a scientific calculator, a function-plotter, a function calculator (symbolic derivation, simplifying expressions), a matrix calculator (both real and complex numbers), a calculator for complex numbers, a computer-calculator (hexadecimal / binary)
CalculatorPrinterer allows you to create printable math table charts. Select the type of operation (+,-,*,/) and enter the start/end numbers and the step value. The program will create a printable math chart. You can also preview the chart in Pocket Word
SMath Studio Handheld - Absolutely free mathematical program with "paper"-like interface and numerous computing features (now with integrated mathematical reference book)
Pocket Solver - Pocket Solver allows you to solve equations on your Pocket PC. You type in an equation and enter values for all but one of the variables. Unlike a spreadsheet or calculator, any unknown variable can be found without having to rearrange the equation.
Pocket Solver isn't just limited to performing everyday calculations
PiCalc - PiCalc is a utility that calculates the number pi down to 20,000 decimal places. As the site explains, the interest of such a program lies in testing your machine's processor speed.
Then you can compare your score with those available on the program's web site