Compy Cube: http://twistypuzzles.com/cgi-bin/puzzle.cgi?pkey=1821 (equivalent to Redi Cube with centres, as mentioned above)
Rex Cube with straight cuts: http://twistypuzzles.com/cgi-bin/puzzle.cgi?pkey=6624 (another corner-turning puzzle, but with deeper cuts like a skewb)
Rex Cube with straight cuts: http://twistypuzzles.com/cgi-bin/puzzle.cgi?pkey=6624 (another corner-turning puzzle, but with deeper cuts like a skewb)