A Roman Numeral Calculator. Ratio Mercatoris (formerly Ratiocinator) is a calculator program using Roman Numerals. Also, has built-in Financial and Scientific (Ancient Rome) functions.
Deal or No Deal clone. Select one of twenty-six cases, each with random amounts of money inside ranging from $0.01 to $1,000,000. Then open the rest of the cases, individually, knocking off values. The banker offers amounts of money for your case.