Overlapping 3x3x5A 3x3x4 (which is based on a 3x3x5) is modified like the Overlapping 4x4x4 was made out of a mass produced 4x4x4.
Pancake cubeA 3x3x4 was transformed by removing some pieces and exposing some others.
QuartetA four-sided puzzle comparable to the Grimace.
Rubik's 4x3 CubeThe Rubik's 4x3 Cube® is the incredibly addictive cousin of the Rubik's 5x3 Cube®. From the Duane Cash Cube Collection.
Rubik's 5x3 CubeThe Rubik's 5x3 Cube® is 5x3x3 six-sided puzzle that is hand-assembled and solidly constructed. From the Duane Cash Cube Collection.
Rylox PrismA bandaged and extended 4x4x4.
A mass produced version is also available.
Scramble (Super Floppy) CubeAn enhanced version of the Floppy Cube from the same inventor. A floppy cube where you can turn the faces 90 degrees.