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Elem (Popularity: ): Free program for the interpretation of elemental analysis results. For Windows and Unix; source code available.
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Physicochemical Calculators (Popularity: ): Simple online and offline calculators for boiling point at reduced pressure, unit conversion, and molecular mass.
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Visual MINTEQ (Popularity: ): A free equilibrium speciation model, which calculates chemical equilibria in aqueous systems at low ionic strength.
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ChemCalc (Popularity: ): Online calculator for molecular formula, molecular weight, elemental composition, and isotopic distribution. Java recommended.
Formol (Popularity: ): Open source command-line molar weight calculator. C++ source code and Linux packages available.
McDalton (Popularity: ): Free formula mass calculator for Windows, uses the latest values of atomic weights as recommended by IUPAC. For educational purposes, shows calculations as well as the uncertainty of the result.
Mole Calc (Popularity: ): Free software for Windows for the calculation of molecular weights. Also available in French.
Molecular Weight Calculator (Popularity: ): A web-based program that calculates the number of constituent atoms, molecular weight, and percent composition based on a molecular formula.