Mixup 3x3x5A cubic 3x3x5 that allows an additional mixup turn.
OctexA fishered Master Skewb.
Octo-StarA face-turning cube, capable of 45 degree turns in some circumstances.
Offset 2x3x3The concepts of the I-Cube and the One-plane-bumped-cube combined.
Offset CubeA cubic 2x2x7 with a twist that allows the pieces to be exchanged between the layers.
Pink GearsA sticker variant of the Gear Cube Extreme to make the puzzle easier. It is still not trival though.