Problems, Games, Graphics, Puzzles and Simulations
Express Review Guides: Math Word Problems
The Calculus Page Problems List
Cut-the-Knot! The parent site of an extensive collection of interactive mathematics and puzzles authored by Alexander Bogomolny.
Larry Green's Mathematial Applets Page Basic math, algebra, and statistics presented in fun games and word problems.
Mathematical Visualization Toolkit
WebMath Webmath is a math-help web site that generates answers in real-time to specific math questions and problems, as entered by a user.
Interactivate's Math Activities
PhET Interactive Math Simulations
QuickMath Automatically answers the most common problems in algebra, equations and calculus faced by high-school and college students.
Graphics and Animations for the Calculus Classroom
Calculators and Converters
iFigure's Math and Statistics Calculators
WIM's Online Calculators and Plotters
Megaconverter (2nd version)
Desmos Math Calculators (scientific, graphing, four function, matrix, etc)