ConversionMaster 1.7 for Mac was available as a free download on our application library. The program relates to Business Tools.
From the developer:
ConversionMaster is a measurement unit conversions calculator for the Mac, containing many hundreds of metric/S.I., imperial, U.S., and other units in its database, most to 14 significant digit precision. New units can be added and unwanted ones removed. Supports ft/in/fractions, different number formats including scientific notation, and complete control of significant digits.