MathGrade.com

Interactive Mathematics Miscellany and Puzzles
Java-based math resource including articles, puzzles and links.
www.cut-the-knot.com/

Colorful Mathematics
Educational software presents advanced mathematics to K-12 students in a game-oriented approach, using coloring and drawing techniques to illustrate concepts from graph theory and computer science.
www.math.ucalgary.ca/

Mathematics Problem Solving Task Centres
Designed to assist teachers and students in problem solving. Includes problem of the month.
www.mav.vic.edu.au/

Amusements in Mathematics
Riddles by Henry Ernest Dudeney.
www.thinks.com/

Gallery of Mathematics / Self-referential Sentences
Produced by Andy Burbanks. Good explanation with examples.
info.lut.ac.uk/

Cut the Knot: Interactive Mathematics Miscellany and Puzzles
Features instructional games and puzzles based on a variety of math topics. Includes more serious articles about the language of math and related links.
cut-the-knot.com/

I Collect Wooden Jigsaw Puzzles
Contains information and pictures of children's puzzles from the 19th century and adult puzzles from the 20th century. Showcases items on loan from past exhibit in the Healdsburg Museum.
www.icollectpuzzles.com/

PHILTAR - Philosophy of Mathematics
Links to pages on individual philosophers.
philtar.ucsm.ac.uk/

UC Berkeley Astronomy-Mathematics-Statistics Library
Library information, electronic guides, journals, indexes, and databases, and links to campus departments. Includes access to the California Digital Library sections for astronomy, math/statistics, and physical sciences.
www.lib.berkeley.edu/

Instituto Superior Tecnico Mathematics Library
Access to European and American preprints, journals, and digital libraries for math and related fields. Site in English and Portuguese.
www.math.ist.utl.pt/