Software

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.
http://www.joshmadison.com/software/convert/

OmniCon
Metric to Imperial unit conversion software for Windows 98/ME, Windows NT/2000.
http://members.execulink.com/~pjones/

QM Laboratories
Desktop utility software, includes a Windows 32-bit desktop utility that converts both world time and unit measures.
http://www.qmlsoftware.com

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.
http://www.timezones.net

Unit Conversion software from ESSCo
Flexible unit conversion software for Windows, Excel and Crystal Reports.
http://www.unit-conversion.com