Ergh, I haven't even paid attention to developers until recently. I'll just name whatever games I can think of:
Mischief Makers: Awesome game for N64. I don't know why I like it so much.
Gauntlet games: Fun if you have people to play with, but boring after you beat them.
Halo was very fun, but after playing it for a few hours it just became another FPS (a good one, but still just an FPS).
River City Ransom: This game is funny to play.
Little Nemo: Fond memories.
Some cool SNES game about two short fighter dudes travelling through place and fighting stuff. I'd love to remember what this game was called.
I'm not a big RPG fan, and those seem to be the best non-Nintendo games. Oh, and Sly Cooper is also an awesome game.