Recreational Mathematics
- Gathering for Gardner 4
- Geometry Center (Science U)
- Geometry Junkyard
- Keypress
- Math puzzles
- Math World
- Mathematical Association of America
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Newsletters and Mailing lists
- Cubism For Fun
- Nobnet
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Online puzzle shops
- Archimedes Laboratory
- Binary Arts
- Bits and Pieces
- Davans
- Donay - Games, Puzzles
- Faze3 (Alan Ford)
- Fiddl Widdit - Wire Puzzles
- Gemani Puzzles
- Kadon Enterprises
- LiveCube - Puzzle Building Toy
- Livewire Puzzles
- Pentangle
- Philos
- Rombol
- The Puzzle & Craft Factory
- Thinkfun
- Thinks.com
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