Maple is a commercial computer algebra software package. It’s an educational software tool to help users with mathematics, application development, and engineering. The latest version is Maple 17, and is available for student, academic, government, and commercial purchase.
GNU Octave is a high-level language, primarily intended for numerical computations. It provides a convenient command-line interface (CLI) for solving linear and nonlinear problems numerically, and for performing other numerical experiments using a language that is mostly compatible with MATLAB.
GNUPlot is a command-line program that can generate two- and three-dimensional plots of functions, data, and data fits.