Hello, I'm Nathaniel, and this is my collection. It's not too big, but it's what I've got.
3X3X3
Rubik's Cube
Quantity: 18
I have in total 18 3x3x3's, mostly DIY's that fall under A, C, E and F.
5X5X5
6X6X6 & UP
V-Cube 7
Quantity: 1
The first 7x7x7. A seven layered cube.
CUBOID
2x3x3
Quantity: 1
I own the Cube4You version
OCTAHEDRON
OTHER EIGHT-SIDED
DODECAHEDRON
Gigaminx
Quantity: 1
I may have one of these, but it's broken.
Megaminx
Quantity: 1
This is a newer version of the Megaminx, published by Meffert, with tiles and 12 distinct colors.
FOUR
Mastermorphix
Quantity: 1
Once again, I own the pillowed version made by C4Y and Meffets.
Tetrahedron
Quantity: 1
I own the pillowed Mefferts Version, more commonly known now as the Jing's Pyraminx.
SPHERE
CYLINDER
Bump Cheese
Quantity: 1
A bumped variant of the Cheese-puzzle. A six segment prism with one layer.
MECHANISM PICTURES
4x4x4 Mechanism
Quantity: 2
larger version of the 3*3*3, I have one by QJ and one ES Super Cube