SAGE 3.4.1 - Open source advanced mathematics software. (Free): "SAGE: Open Source Mathematics Software... Creating a viable free open source alternative to Magma, Maple, Mathematica, and Matlab.
General and Advanced Pure and Applied Mathematics
Use SAGE for studying a huge range of mathematics, including algebra, calculus, elementary to very advanced number theory, cryptography, numerical computation, commutative algebra, group theory, combinatorics, graph theory, and exact linear algebra."
MacUpdate - Universal Binary - http://www.macupdate.com/macintel.php