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Mathematica demonstrations covering almost every aspect of high school algebra and geometry needed for the study of calculus.

Fun and easy-to-use interactive game to help students learn or review polar coordinates and, in particular, radian measure of angles as a decimal number (rather than a multiple of $$\pi$$).

Interactive quizzes allow students not only to see if their answers are correct but also to access online explanations of the ideas and techniques needed in order to understand and do the quiz pro
Colorful presentations, many of them interactive, of topics from elementary algebra on up that students should know when they enter a calculus course, including inequalities, exponents, logarithms
In the M-N definition of an infinite limit at infinity, students get to select M and then adjust N to satisfy the definition.

This webpage contains links to two separate ActionScript applets for graphing multiple functions.

This GeoGebra applet and accompanying activities illustrate the formal definition of a sequence of real numbers converging to a limit $$L$$ through a series of interactive exercises.

This worksheet provides an examination of the Fundamental Theorem of Calculus both graphically and numerically using a graphing calculator.

This animation is a dynamic representation of the area function in the standard proof of the Fundamental Theorem of Calculus.
This applet uses many examples to dynamically illustrate the Fundamental Theorem of Calculus and the meaning of the definte integral in terms of areas.