Mathematics Comics

http://xkcd.com/ (maintained by Randall Munroe) is a fantastic website for mathematics, physics, and computer science themed cartoons.  I would also recommend clicking the “What If?” at the top-left corner of the page.  If anyone knows of any other good...

using GeoGebra

Geometer’s Sketchpad is a useful tool for visualizing euclidean constructs, as well as a multitude of other things.  However, it is also expensive, with a new license running around $70, and renewals at $50. Luckily, there is an open source version of the...