Units (Unix)
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Units is a Unix computer program for conversion of units of quantities. It has a database of units, including esoteric and historical units. This for instance allows you to convert velocities specified in furlongs per fortnight, if you really wish. The plain text database units.dat, is in fact a good reference in itself.
The original units program has been a standard part of Unix since the early Bell Laboratories versions. UDUNITS is a similar utility program, except that it has an additional programming library interface, and has several date and time conversions. UDUNITS is currently considered the de facto program for variable unit conversion for netCDF files.
The relatively newer GNU free software version of units (or GNU Units) is written by Adrian Mariano.
