Simfit, a free package for simulation, curve fitting, statistics, and plotting

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http://www.simfit.org.uk/index.html
Simfit is a free software OpenSource Windows/Linux package for simulation, curve fitting, statistics, and plotting, using a library of models or user-defined equations. It can be used in:

• biology (nonlinear growth curves);
• ecology (Bray-Curtis dendrograms);
• psychology (factor analysis);
• physiology (membrane transport);
• pharmacology (dose response curves);
• pharmacy (pharmacokinetics);
• immunology (ligand binding);
• biochemistry (calibration);
• biophysics (enzyme kinetics);
• epidemiology (survival analysis);
• medical statistics (meta analysis);
• chemistry (chemical kinetics);
• physics (dynamical systems); and
• mathematics (numerical analysis).