1)   Regression analysis - CurveFitter 1.1
CurveFitter program performs statistical regression analysis to estimate the values of parameters for linear, multivariate, polynomial, exponential and nonlinear functions.
graphing, data analysis, plotting, curve fitting, nonlinear regression, non-linear regression, non linear regression, data fitting, non linear curve fitting, nonlinear curve fitting,

 2)   Auto2Fit 3.0
Auto2Fit is a robust, flexible, easiest-to-use regression, curve fit, global optimization, equation solving and parameter estimation program by using Evolution Algorithms (EAs).
Nonlinear Regression, Global Optimization, Genetic Algorithms, Parameter Estimation, Curve Fit,

 3)   Scientific calculator - ScienCalc 1.1
ScienCalc is a convenient and powerful scientific calculator. ScienCalc calculates mathematical expression. It supports the common arithmetic operations (+, -, *, /) and parentheses.
graphing, data analysis, plotting, curve fitting, nonlinear regression, non-linear regression, non linear regression, data fitting, non linear curve fitting, nonlinear curve fitting,

 4)   NLREG 6.2
NLREG performs nonlinear regression and curve fitting. NLREG fits a mathematical function whose form you specify to a set of data values. Virtually any type of function can be fitted.
nonlinear regression, curve fitting, regression, modeling, surface fitting,