Sage: Open Source Mathematics Software

Once I get the hang of Maxima I think I will give this a go again. This can call software such as Maxima, Octave, etc.

Sage: Open Source Mathematics Software

Sage is a free open-source mathematics software system licensed under the GPL. It combines the power of many existing open-source packages into a common Python-based interface.
Mission: Creating a viable free open source alternative to Magma, Maple, Mathematica and Matlab

Link to introductory videos on Sage and Python from the Sage website:

Screencasts and Videos - http://sagemath.org/help-video.html

Link to help and documentation from the Sage site:

http://sagemath.org/help.html