GNU Octave - GNU Octave is a programming language for scientific computing.
Anoc Octave Editor - Write scientific documents in LaTeX and perform mathematical calculations in Octave. Visualize the result in a PDF (LaTeX) or in a plot (Octave)
QtOctave - QtOctave: a front-end for Octave/un Front-End para Octave
Derive - Derive 6.1: Powerful system for doing symbolic and numeric mathematics.
MATLAB - A high-level language and interactive environment for numerical computation, visualization, and programming
WIRIS cas - WIRIS cas is a web-based program for mathematical calculations.