Mechanical
http://www.puzzles.com/ (Rank: 35509)
http://www.passionforpuzzles.com (Rank: 114272)
http://www.puzzles.ca/ (Rank: 118395)
http://www.puzzlesolver.com/ (Rank: 146040)
http://www.mefferts-puzzles.com (Rank: 277970)
http://www.johnrausch.com/PuzzleWorld/default.htm (Rank: 306033)
http://www.tangrams.ca (Rank: 343141)
http://www.puzzlemuseum.com/ (Rank: 429132)
http://www.teachnet.com/brainbinders/ (Rank: 644296)
http://www.tavernpuzzle.com (Rank: 1031373)
http://www.pottypuzzles.com (Rank: 1160078)
http://brasspuzzlesbyrocky.com/ (Rank: 1304736)
http://www.puzzle-factory.com/ (Rank: 1400662)
http://www.smartbytes.co.uk/Tumbler/ (Rank: 1715573)
http://www.puzzlesolver.com/list.php?cat=5 (Rank: 2544760)
http://look.net/hockeypuck/ (Rank: 2700064)
http://www.parlorpuzzle.com (Rank: 2778317)
http://www.toad.net/~elva/slocum.html (Rank: 2778317)
http://www.slube.co.uk/ (Rank: 2778317)