Sogol 

Math Assistant and Hypertext Notepad for Engineers and Scientists using Windows. Assists with calculating networks of formulae, dynamic simulations, equation solutions, differential, multiple equations and unknowns, with built-in script language.
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pSogol 

Math Asst., Calculator, and Hypertext Notepad for Scientists and Engineers using Pocket PC 2003. Assists with calculating networks of formulae, dynamic simulations, equation solutions, multiple equations and unknowns, builtin script language.
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RF21 

Graphing scientific calculator with ample support for user defined functions and libraries. Numeric features include derivation, integration, Monte Carlo simulations, Runge Kutta, matrix inversion, nonlinear equation systems, function minimizer.
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