Convert - Handles metric, Imperial, US, and user-defined units for common and engineering measurements. Includes common constants. Customizable For Win9x and later versions. By Josh Madison.
OmniCon - Metric to Imperial unit conversion software for Windows 98/ME, Windows NT/2000.
QM Laboratories - Desktop utility software, includes a Windows 32-bit desktop utility that converts both world time and unit measures.
Time and Metric Conversion Wizard - Software for sale - demo available. View current times in over 400 cities around the world and convert between English and metric measurements.