Aqaurius Soft PC Unit Converter 

Aquarius Soft PC Unit Converter is a simple and fast unit conversion software for the Microsoft Windows platforms. One of the main features of this unit converter is the ability to let you add your own custom units for conversion.
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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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