There's a great open source alternative to Mathematica called Sage: http://sagemath.org http://sagemath.org. It's purpose is to offer the same sort of functiona

There's a great open source alternative to Mathematica called Sage: http://sagemath.org http://sagemath.org. It's purpose is to offer the same sort of functionality as many of the commercially available math programs but only using free and open source tools.