Just wondering which studios (current and defunct) were your most favorite?

Here's a partial listing of the some of the famous companies. Feel free to mention those that I may have missed.

Disney
Warner Bros.
Hanna-Barbera
Fleischer Studios
MGM
Ruby-Spears
Filmation
Jay Ward Productions
DePatie-Freleng Enterprises
Nelvana
DIC

Others.....

Classic
MGM- (Tom & Jerry/ Harmonising Cartunes)
Walt Disney ( Mickey , Donald and lots of fairy tales )
Fleisher Studios ( Popeye, Superman, Betty Boop )
Warner Bros ( Bugs, Porky...well, you know )
Walter Lanz ( Woody Woodpecker/ Andy Panda )
Paul Terry Terrytoons ( Mighty Mouse, Heckle and Jeckle...long underated , IMHO )

Anime
Kitty/Madhouse ( Ranma 1/2 , Urusei Yatsura )
Studio Ghibli ( Princess Mononoke, Spirited Away, Howls Moving Castle )
Sunshine ( Inuyasha, Dirty Pair )
Gainax ( Evangelion, Otaku no Video )
Toei ( Sailor Moon, Magic users Club )