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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.
Wolfram's demo for the product rule, with dropdown menus for the functions. Users can download the free Mathematica Player to play a live version of the demo.
This applet is designed to build the student's visual intuition about the line tangent to a curve at a point being the limit of the secant lines through that point.
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.
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.
Essay giving very brief biography of l'Hospital, the history of his and Johann Bernoulli's rule, and a slightly modernized diagram for and version of the proof he and Bernoulli gave.