Ever heard of Maxima? http://maxima.sourceforge.net/ http://maxima.sourceforge.net/ Maxima which is a direct decedent( I think they even share code now) of Mac

Ever heard of Maxima? http://maxima.sourceforge.net/ http://maxima.sourceforge.net/ Maxima which is a direct decedent( I think they even share code now) of Macsyma one of the first symbolic math packages developed at MIT. Wolfram was inspired by it when he created Mathematica. In fact I think it was because he despised macsyma (cause it was in lisp and not C I believe, there are some mailing list post describing the events) that he decided to create Mathematica. So the enemy of your enemy is your friend ;p