Online since 2002. The most comprehensive site for all around twisty puzzles.

Rotating balls
Tracker BallOne icosahedron and three octahedra rotate against each other in a single puzzle.
Tracker Ball 3DFive rotating balls in a cage that forces all five to rotate together.
Unknown Rolling CubesEight cubes (four inverted) in a plastic cage. Four of them rotating in conjunction.

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