Math 202
Links related to section 10.1 (Plane Curves)
Index of Famous Curves Contains information on dozens of curves, including the definitions for the curves, associated curves, and applet which allows you to adjust values controlling the shape of the curves.
http://www.dogbomb.com/spi/ Applet for constructing Spirograph type curves.
http://www.math.dartmouth.edu/~dlittle/java/SpiroGraph/ Another Spirograph applet.