Aqaurius Soft PC Unit Converter
Aquarius Soft PC Unit Converter lets you quickly convert between 2 units, like converting between square meter and square foot etc. One of the main features of this unit converter is the ability to let you add your own custom units for conversion... which means you need not wait for the software...
http://www.aquariussoft.com/downloads/asuc1_00.exe - 860Kb - Download - Screenshot

Unit Conversion Tool
Unit conversion tool can convert about 250 various types of measurement units from one system of measure to another. It can convert Length, Weight, Volume, Area, Density, Power, Time, Count and other units. Unit conversion tool is scientific software and developed for fast and easy unit conversion. ... Supported units of length: Centimeters, Cubits (Long Biblical), Cubits (Short Biblical), Decameters, Decimeters, Ells, Fathoms, Feet, Freet (U. ... Survey), Fingerbreadths (Biblical), Furlongs, Hands, Hectometers, Inches, Kilometers, Leagues (British), Leagues (International), Leagues...
http://www.unitconversiontools.com/UCToolSetup.exe - 919Kb - Download - Screenshot

Unit Conversions 2000
Unit Conversions 2000 is a small utility that will allow you to quickly convert units of measure from one system to another. Facilities are included to convert various Lengths, Weights, Volumes, Areas, Density, Power and Scale measurements.
http://www.gregorybraun.com/UCONVERT.ZIP - 170Kb - Download - Screenshot

AccelWare Unit Conversion Tool
AccelWare Unit Conversion Tool is a powerful, intuitive and easy-to-use utility for quick and 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. ... The categories include: length, weight, speed, mass, numbers, volume, dry volume, time, density, force, pressure, energy, power, flow, temperature, angle, light, fractions, data transfer, data storage, and more! ... Features include: high accuracy with support of the number of decimal places to display, ability to save results...
http://www.accelware.com/Unit_Conversion_Tool/uctsetup.exe - 944Kb - Download - Screenshot

Convert It
Convert it is a program converting various types of measurement units(supports more than 200 unit types). The program has seven main categories of units each containing lots of unit types in them. These categories are as follows; Length Weight Volume Area Density Power and Count it also has a... It can also learn new units and make conversions between the integrated units in the program and the units that have been taught. ... The program is fully customizable by default it supports English Turkish and German if needed other languages can be adapted easily.
ftp://ftp.skali.com/pub/download/C/conver10.exe - 1Mb - Download - Screenshot

FNA
FNA FNA is a multi-function scientific calculator and unit conversion utility. Four modes of operation (statistics, trigonometry, base-n, and unit conversion). Convert units of Acceleration, Angle, Area, Density, Energy, Force, Fuel Efficiency, Length, Mass/Weight, Power, Pressure, Speed,... Version 1. ... Built-in references now include Periodic Table of Elements with extensive chemical data, drop-down conversions for metric prefixes, counting units and atomic weights. ... 31a now has support for German, Dutch, Swedish, Italian and Portuguese keyboards.
http://www.rjsoftware.com/files/FNA_131.zip - 319Kb - Download - Screenshot

TechSheet
TechSheet is a technical spreadsheet intended for use by scientists, engineers and technicians. This spreadsheet allows for calculations that incorporate units of measure with its associated value within each individual cell. Numerical manipulations are accomplished in a fashion that ensures... Like any good scientist, TechSheet is aware of the rules for calculating with units; so for instance if a "length" is multiplied by a "length", TechSheet will show an "area" result (meters * meters results in square meters).
http://www.kinematrix.com/vip/techsheet2_0.zip - 2Mb - Download - Screenshot

APSW Instant Converter
If you've ever had trouble converting units, or don't know how to turn on a calculator, this is an invaluable tool. A universal conversion program that provides conversion for heat, length, area, weight, volume, time, angular, timezones, power, energy, SI units and Avoirdupois weight and much more. ... This program is a very simple, intuitive, useful and nice unit conversion program. ... APSW Instant Converter offers nearly every kind of conversion imaginable and gives an instant response. ... This is a very useful piece of software for anyone in education, especially mathematicians or...
http://www.allpurposesoftware.com/downloads/instantconverter.exe - 4Mb - Download - Screenshot

A-Converter
A-Converter is a handy utility, that can handle unit conversions in number of categories, such as Length, Volume, Area, Mass, Time and more. Just enter the value, select category with the source units and you will get the list of converted values, ready to be copied into the clipboard with or... A-Converter is designed to be very compact, consuming little desktop space while active and minimizing to the system tray. ... There are several options to customize the appearance and behavior of the program.
http://www.xeletrix.com/download/acv10sr1.exe - 560Kb - Download - Screenshot

EngCalc(Machin Design) - Palm Calculator
Momentous Machine Design Calculator. Features.. NEW Constant Values. NEW New look Sceintifc Evaluator. NEW Material properties. Mechanical, Physical and Thermal. NEW Periodic chart of Elements. NEW Inplace unit conversion to switch between US and Metric units. ... , Sizing Drive Pulleys Speed, Spiral Wire Weight, Three Gear Drives, V Belt Length,Worm Lead,Bridge Brakes,Capacities of Apron and Pan Conveyors, Capacity of Flat Belt,Capacity of Troughed Belts,Convert Belt Speed into RPM, Conveyor Capacity of a Screw Conveyor,Developed Length of Pipe Bends,Discharge Angle for Belt Leaving...
http://www.3grtech.com/EngCalcPalm_MD.zip - 1Mb - Download - Screenshot