Master Skewb diamondA master skewb transformed into octahedral shape. Also appropriately described as face-turning octahedron with central face pieces.
Mini Master OctahedronAfter the Master Octahedron from the same inventor another 5x5x5 transformed into the shape of an octahedron.
OctacleThe concept of the Trifurcation Cube applied to an octahedron.
OctadotA curved cut version of Trajber's Octahedron.
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.