The site was frozen for a while in anticipation of a new NSF grant. With the infusion of money it got a face lift. In particular, the Java section has been expanded to include a Kali program. Frequently Asked Questions in Mathematics . A collection of mathematical assays maintained at the University of Waterloo.
Special pages describe Famous problems in Mathematics.
The site is a valuable on-line source of information but not as comprehensive or well organized as Eric's Treasure Trove . But there is a promise hence the hope. MathSoft creators of Mathcad, maintain a puzzler page. The software is fantastic and fits better into everyone's budget than Mathematica . Puzzles are assumed to be solved using Mathcad.