http://www.mathworksheetsland.com/resources.html
nrich – FREE and interesting mathematical games, problems and articles
14 Ideas for Interactive Maths!
http://www.diagnosticquestions.com/
Microsoft Mathematics 4.0 – provides a graphing calculator that plots in 2D and 3D, step-by-step equation solving, and useful tools to help students with math and science studies.
chartwellyorke – Professional tools for learning and teaching.