Manufacturers? Most of these seem pretty obvious, but I have seen people ask...
BBi = Blue Box International (but everyone always calls them just BBi)
DiD = Dragon In Dreams (gee, I wonder what that means...?)
DML = Dragon Models Ltd - aka "the big lizard"
HT = Hot Toys
NLM = Newline Miniatures
RA = Reload Action
RMC = Realistic Miniature Collectible Co.
SST = Sideshow Toys
ST = Saturday Toys
TS = Toy Soldier
I must admit I had no idea that SUCK was actually an acronym?!
edit: Now I realise that most of those are already on the list - for some reason I didn't notice them when I first read through it, I must have only noticed the acronyms I didn't already know, lol!