Recommend some useful math-related sites to you:
Forums:
The Math Forum @ Drexel University
Math Help Forum
Math Is Fun Forum
S.O.S. Mathematics CyberBoard :: Index
Softwares:
Roman Lab Software
Graph Functions, Graph Equations, Creating Data Graphs
Alentum Software - advanced software for Windows
CGAL - Computational Geometry Algorithms Library
Welcome to Dekov Software
Discount Educational Softwares
Linear Programming and Sheet Cutting Library
Sites:
Math.com - World of Math Online
Mathematical Association of America: MAA Online
--John