VOTING THEORY
- Some nice applets by Jeff Brown at UNC-Wilmington.
- Electowiki, a whole wiki just on election methods.
- New Yorker article by Anthony Gottlieb on the mathematics of voting.
APPORTIONMENT
- An apportionment calculator applet (Hamilton, Lowndes, Jefferson, Webster, and Hill-Huntington methods).
- The Constitution and Paradoxes, an interactive article featuring applets.
- The Census Bureau's apportionment page.
- A brief history of apportionment.
- American Scientist article by Barry Cipra on the mathematics and history of apportionment.
- The seven border (frieze) pattern symmetry types
- Java Kali - a program that lets you draw frieze and wallpaper patterns with different symmetry types
- All 17 wallpaper symmetry types, with geometric explanations
- wallpaper symmetry applet
FRACTALS
- Dr. Riddle's Iterated Function Systems page and IFS Construction Kit
- The Dynamical Systems and Technology Project at Boston University
- Fractals in nature
- Koch snowflake construction applet
- Koch snowflake construction movie
- Koch snowflake zooming movie
- Sierpinski triangle construction applet
- The Mandelbrot set
- The Oracle of Bacon
- The Internet Mapping Project
- A Facebook network graph
- Erdos number graph
- An applet for finding Euler circuits