Feliks PillowA pillowed 3x3x3 mass produced by Mefferts and dedicated to Feliks Zemdegs.
Fence CubeA bandaged 3x3x3 with movable restrictions.
Fifteen CuboStricker variation. Sold by the italian license taker of ITC during the original cube craze.
Full Turn CubeThis is a 3x3x3 which allows only 360° turnes. It is a puzzle that isn't.
Fused cubeFused cube. Technically the same as the Fused Cubes, but only one cube. Seven cubies are fused to make one, Eight if considering the inner 1x1 core, leaving only FRU movements possible.
Fuzzy CubeA 3x3x3 with colored pom-poms glued on every single sticker.
Geary CubeA geared Rubik's Cube with opposite faces moving in opposite directions.