Please note that I am an amateur and so do not have a very exciting collection...yet. :)
2X2X2
3X3X3
4X4X4
5X5X5
6X6X6 & UP
CUBE (SHAPE PRESERVING)
CUBE (SHAPE CHANGING)
CUBOID
OCTAHEDRON
OTHER EIGHT-SIDED
DODECAHEDRON
RHOMBIC DODECAHEDRON
FOUR
TEN
FOURTEEN
SPHERE
CYLINDER
OTHER SHAPES
MOVING HOLE
MOVING MARBLES
SIAMESE & FUSED
FOLDING
OTHER MECHANISMS
GAMES