don't know that there's a listing anywhere....
- swapping springs
- lighter, heavier
- swapping tops
- different material for sound difference or LED compatibility, or just for aesthetics (different colors)
- swapping stems
- from clicky to tactile to linear to dampened, different brands or materials
- switch films
- reduce wobble in certain switches, can effect sound as well
- lubing
- type of lube/s used
- how/where lube was applied
- silencing clips
- stem modification (jailhouse, etc..)
there are tons of switches and millions of possible combinations.....