Advanced Converter 

Advanced Converter is a professional program for conversion units of measurements. The program contains more than 1700 units divided in 66 groups. You may add and arrange groups and units in according with your personal preferences.
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Uconeer 

Freeware. 397 units in 46 categories. Includes engineering specific categories like enthalpy, heat capacity, heat transfer coefficient, torque and viscosity. Work with feet and inches. Formatting and clipboard features. Excludes archaic units.
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Cresotech Convert-It 

Cresotech CONVERT-IT is a convenient Pocket PC based tool to convert different measuring system units into each other, and much more!
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AccelWare Unit Conversion Tool 

Unit Conversion Tool is a powerful, intuitive and easy-to-use utility for accurate conversion between almost every possible units of measure, from one system to another. The latest version includes more than 2200 units in 78 conversion tables.
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MITCalc - Technical Formulas 

Solutions to dozens of basic formulas from physics, technology and mechanical engineering. Help, pictures as well as many selection tables with values of various coefficients and material properties are available for the formulas. Units convertor.
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UNITS32 

Conversions of units and currencies are done efficiently by using a single input-field. You type like you think, entering a number and the beginning of a unit, name or symbol. The assistant will automatically display the possible units.
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