R Lang - R is a free software environment for statistical computing and graphics.
GNU Octave - GNU Octave is a programming language for scientific computing.
AMPL - A mathematical programming Library (AMPL).
MATLAB - A high-level language and interactive environment for numerical computation, visualization, and programming
QtOctave - QtOctave: a front-end for Octave/un Front-End para Octave
SMath Studio - Tiny, powerful, free mathematical program with WYSIWYG editor and complete units of measurements support.