NumericalChameleon

The NumericalChameleon converts numbers with a precision of up to 1000 significant figures. It supports more than 3200 units in 82 categories, including lengths, areas, volumes, durations, bits & bytes, angles, temperatures, exchange rates, roman numerals, spoken numbers, colorcodes, unicodes, all 35 radixes, and more. You have unlimited access for adding, modifying and deleting categories, units and icons. Update exchange rates with the GUI or at the commandline (filters for 10 webservices are supported). All configuration data are stored in flat files. Select also your favorite Look & Feel and Theme.