gonvert is a conversion utility that allows conversion between many units
like CGS, Ancient, Imperial with many categories like length, mass,
numbers, etc. All units converted values shown at once as you type. Easy
to add/change your own units.

Features:

   - 38 categories, 698 units.
   - All units converted values shown at once as you type. 
   - Descriptions for many units. 
   - Sort Units or values. 
   - Fully OPEN source so that you can add your own custom calculations
     and descriptions. 

WWW: http://www.unihedron.com/projects/gonvert/