Meffert's World of Puzzles (Popularity: )

Manufacturer of many different types of Rubik like puzzles.
Category: Games\Puzzles\Mechanical

Millstone (Popularity: )

'Marble Crazy', 'Bubble Trouble' and other fun programs for Windows.
Category: Games\Video Games\Freeware\Developers

3-D Chess Federation (Popularity: )

A place for those who are especially interested in 3-D (by contrast to ordinary 2-D) chess variants. Offers information, rules, downloads, photos and diagrams.
Category: Games\Board Games\Abstract\Battle Games