Octahedron AxisA 3x3x3 was transformed into an Axis Cube which was transformed into an octahedron.
OctahinxA Megaminx in shape of a octahedron.
OctaminxA fairly accessible custom build based on the Pyraminx.
OctanovaA skewb octahedron with a 10-piece-circle at every edge.
OctaStar IIThe successor of the 24-Octahedron. A hybrid puzzle that adds faceturning abilities to the Little Chop.
Okki Gem I (aka Alexanders Gem)A sticker variant of the Okki which transforms the puzzle back into a puzzle equivalent to the 2x2x2. Produced in East Germany but often customly remade.