My collection isn't very impressive. If I didn't sell most of the things I build, it would be much bigger:
Current functional puzzles:
Skewb ball
Bump cube
Gigaminx v1.5
V-cube 6
V-cube 7
White type a 3x3
Impossiball
Void cube
Sea Krait Biohazard
Biohazard DIY
Pyraminx
Randomly truncated eastsheen 5x5, pretty much useless
Sold puzzles:
Cubie chaos 1
siamese cubes
3x3x4
Rhombiminx 1, 2, and 3
Skewb star
2x3x4
White spindle domino
half/half domino
Puzzles that are broken/missing parts:
Gigaminx v1 (popped, parts missing)
Pyraminx Crystal
Cubic 4x4x5
Chinaminx (gutted for Gigaminx 1.5 screws/springs)
Tiled "Speed megaminx" (tiled pvc megaminx)
"2x2x3" variation (not slim tower)
A spindle domino waiting to be reassembled
I need to get myself in gear and fix some of these puzzles (gigaminx v1) because they are too valuable to just let rot.