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So, what companies are those?
For me those two companies are Necromancer & Kenzer (Kalamar line). I do buy SOME WOTC items, like the FR line books, but the last "core" product I bought was BoVD, and before that it was MotP. I don't own any of the splats, or other core supplemental books (hard or softcover) except for the LGG. I will be picking up the revised books, the DLCS and MAYBE the FR Underdark book.
I've found Fantasy Flight Games to be the closest to how I game, but Mongoose, Bastion, AEG, Green Ronin, MEG, and so many others still do great products. The problems is finding them.
I've skimmed some of the FFG books, and I purchased that $4.95 doo-hickey. I think they do a pretty good job as well. I just haven't found enough utility out of their hardcovers . In FFG's case it's not quality but quantity. Same w/ Green Ronin & Malhavoc whom I also consider among the "cream of the crop". I also have OSM from FDP: IMO the best low level D20/3E module available and I'm looking forward to the sequels, but I have not been as enamored of FDP's other stuff..again in that case not a quality issue, but just not useful to me.
Although I have not been impressed w/ the few Troll Lord games purchases I've made, they are starting to put out some stuff for Necromancer, so I'll likely take a look at those items before I dismiss them outright.
I've found Necromancer's adventures as well as the entire Kalamar line much more to my liking and the majority of content very useable (in my homebrew, FR, GH, or the few times I've run a Kalamar game). Both company's products just "click" with me, whereas only small sections of a book here or there from other publishers do... call me crazy