Wolfram Research
Wolfram Math World: Kampyle of Eudoxus
This page gives an illustration, equations, and short description of the Kampyle of Eudoxus, a type of curve studied by Eudoxus in relation to the problem of cube duplication.
Washington State University
Washington State University: Estimate the Area Under a Curve
You can have a good time with this java applet that lets you place adjustable shapes under a curve and then sums the areas to approximate the area of the curve.
Concord Consortium
The Concord Consortium: Molecular Workbench: Epicycloid
View the creation of an epicycloid in this simulation.