Pocket Calculator - Online calculator, written in Java. Includes Square root button and number memory. Source code can be downloaded. A Primer on Cryptarithmetic - Instructions, examples, references and links. Properties of Dice - Polyhedral dice and their properties.
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Recmath - Includes pages on magic squares and polyomino patterns and contains related java applets. This newsgroup archive is a list of puzzles, categorized by subject area. Each puzzle includes a solution, compiled from various sources, which is supposed to be definitive. Recreational Mathematics - University of Newcastle, Australia. Recreational Mathematics - An extensive list of web resources for recreational math.