Since 2005
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Listings
Offers interactive converters for distance, area, volume, mass, time, velocity, force, pressure, energy, power, density, flow, luminance, illuminance, temperature, and angles.
http://www.1728.com/
Numeric formats, temperatures, time zones, measures, and weights.
http://www.convertit.com/
Friendly JavaScript interface converts weight, volume, length, area, speed, pressure, temperature, circular measure, and time into different units and unit systems.
http://www.convert-me.com/
An ever-growing set of weights, measures, and units conversion/calculation modules.
http://www.megaconverter.com/
Converts weight, length, area, speed, temperature, time, and more.
http://www.onlineconversion.com/
Recalculates age to nearest second, minute, days, and weeks on Earth. Also breaks down extra-planetary years.
http://www.re-date.com/
Engineering/scientific unit conversion calculator. Also offers currency conversion and a database of constants.
http://www.unitsiq.com/
Provides a collection of online converters for electrical, energy, mass, temperature, and fuel consumption measurements.
http://www.statman.info/