GNU Octave

GNU Octave screenshots

It's a high-level interpreted language,intended for numerical computations
Main window
GNU Octave 3.2 : Main window

Alternative downloads

Octave Forge
Expands Octave's core functionality by providing field specific features.
4.2.1
FREE
GUIOctave
Create, edit, run, and debug files for the GNU Octave high-level language.
3.6.1
FREE
Prealgebra and Introductory Algebra
It is a program that provides a review of basic arithmetic skills.
1.4.0