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Ed Pegg Jr.'s MathPuzzle
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Cut The Knot (by Alexander Bogomolny)
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Dennis E. Shassa's Puzzling Adventures (in sciam.com)
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Patrick De Geest's World of Numbers
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Cihan Altay's PQRST Puzzle Competition
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Yilmaz Ekici's TurkZeka Puzzle Competitions
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Brain teasers by Barry R. Clarke
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Lloyd King's Creative Puzzles
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Clifford Pickover's Puzzles
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Erich Friedman's Math Magic
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Eric Weisstein's World of Mathematics
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On-line Encyclopedia of Integer Sequences
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Logical and Mathematical Puzzles
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Nick's Mathematical Puzzles (By Nick Hobson)
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Puzzles of Leonid Mochalov
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