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Wolfram's demo for the first four derivatives of a fifth degree polynomial, with sliders for the coefficients of the polynomial and a particular value of $x$.

Three adjacent windows display graphs of (1) a function $f$  and its derivative, (2) a function $g$ and its derivative, and (3) a function $h$ and its derivative.

Java applet allows the user to visualize the washer method for finding the volume of a solid formed by revolving a specific region about the $x$-axis.
This animation shows how a secant line approximates the tangent line at a fixed point when its other intersection with the curve is forced toward the fixed one. This is a Quick Time movie.
This animation shows how to use the slope of a curve to plot the derivative for that curve.
Leibniz: First Published Rules for the Derivative: Images of the first appearances of the Product and Quotient Rules in print in an article by Leibniz in a 1684 issue of the journal Acta Eruditoru
Alphabetical list of well-known curves from Apple of Discord (Cycloid) and Astroid to Wankel's Engine (Reuleaux Polygons) and Witch of Agnesi, with graphs, equations, interesting facts, and histor
Graphs of the brachistochrone curve, including an animation of a "race" along it and other curves, and much historical background.