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Students investigate the limits of the functions $$x^n \sin(^1/_x)$$ as $$x \to 0$$ for $$n = 0, 1, 2$$ and $$3$$.
This GeoGebra applet allows interactive and visual exploration of the relationship between continuity and differentiability.

This is a Loci article that includes five GeoGebra applets to illustrate topics in real analysis, or a rigorous course in calculus.

A systematically presented multi-page course on basic trigonometry: trigonometry of triangles, laws of sines and cosines, angles, radian measure, trigonometric functions.
This applet allows the user to draw three dimensional solids with various cross section shapes, including shapes from standard calculus exercises such as squares, rectangles, equilateral triangles
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
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
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