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MATLAB - A high-level language and interactive environment for numerical computation, visualization, and programming
R Lang - R is a free software environment for statistical computing and graphics.
Function Analyzer - see the graph of a function
Xcos - Xcos is a graphical editor to design hybrid dynamical systems models.
GNU Octave - GNU Octave is a programming language for scientific computing.
Derive - Derive 6.1: Powerful system for doing symbolic and numeric mathematics.