If you haven't already, you might also want to check out Sage (http://www.sagemath.org/ http://www.sagemath.org/) It uses python to "glue" together other free m

If you haven't already, you might also want to check out Sage (http://www.sagemath.org/ http://www.sagemath.org/) It uses python to "glue" together other free math tools (e.g. Maxima) into a unified system with a nice interface.