Many concepts in mathematics can be illustrated by interactive computer applications and animations. In other cases, it is worthwhile to see how computers can help you with mathematical computations. Whenever appropriate I show such tools in class and I keep links to them here, so that you can refer to them later yourself.
Most tools here use either the computer algebra system Sage (via their sagecell tool for embedding in web pages) or Geogebra, which naturally embeds in webpages.
Clock: Useful for exams