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Seven interactive Flash applets that the user may customize for classroom use, with clear instructions included for doing so.
In the epsilon-delta definition of a finite limit, the student gets to select a limit point and epsilon and then adjust left and right deltas to satisfy the definition.
Students choose one of 9 functions and a limit point. Then they can see the value of the function as $x$ gets closer to the limit point.

In the $\epsilon$-$N$ definition of a finite limit at infinity, the students gets to select $\epsilon$ and then adjust $N$ to satisfy the definition.

In applying l'Hospital's rule to the limit of a quotient with indeterminate form 0/0, a student gets to select the numerator and denominator from a list of 6 functions.
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.