The principal features of the website include a comprehensive collection of biographies of over 1300 mathematicians, articles on topics in math history, and a gallery of famous curves. The biographies range from thumbnail sketches of lesser-known figures like Zhang Heng and Juan de Ortega to detailed portraits of major mathematicians like Carl Friedrich Gauss and Emmy Noether. The articles on the history of math range from perfect numbers to general relativity.

Especially fascinating is the section devoted to famous curves, with names like the Witch of Agnesi and the Conchoid of de Sluze. Java applets allow students to alter graphs by changing parameters, as well as to graph associated curves such as the involute and the evolute. Recent additions include more thorough coverage of Greek and Islamic mathematics. Numerous cross-references to books, articles, and other websites make this site a good first stop for anyone researching a topic in the history of math, or the career of a particular mathematician.