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Calculate, weight, metric conversions, gear calculator, linear expansion

Handy Enhanced Scientific Calculator with many features including Paper Trail

You can use it to size an individual circuit in accordance with BS 7671

EnCalcE calculates the cost of purchasing and running electrical appliances

A program that can perform calculations on structural geological data

It calculates any karat desired and give a complete price and weight breakdown

Windows

Windows Mac

Marcus D. Hanwell, Geoff Hutchison and Tim Vandermeersch

Avogadro

Free

Avogadro is a handy tool for creating virtual molecules and compounds.