Das Unit Converter is an easy-to-use freeware program that can handle
virtually all of your unit conversion needs. With over 2,000 units, over 80
categories, and with the ability to add more (units; categories), you may
never need to use an online converter or a search engine for unit conversions
ever again. Some features are: unit searching; history; decimal, fractional
and scientific outputs; significant figures; operations; functions & more.
(in Business and Productivity)