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Essay giving an overview of the history of the number $e$, including various ways of obtaining and representing it. References.
Alphabetical list of well-known curves from Astroid to Witch of Agnesi, with graphs, equations, and a short discussion and history of each curve.
Essay giving a brief overview of the history of the trigonometric functions from ancient Babylon and Greece to medieval India and Europe to more modern times. References.
Essay giving a brief overview of the history of the function concept from intimations in ancient Babylonian tables; to consideration of relations beyond single-formula continuous ones by Euler, Fo
Essay giving a brief overview of the history of calculus from ancient Greeks to Cauchy, with dozens of links to biographies of the mathematicians involved, including Archimedes, Newton and Leibniz
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.