It's a tie between Nintendo EAD and HAL Laboratories. EAD because...it's Nintendo's internal development company. They make the Zelda and Mario games. Enough said. HAL Laboratories because they produced the greatest game ever made: EarthBound. They need to release the next one in America, or so help me God, I'll go on a homicidal rampage.

Runners-up include Square-Enix, Silicon Knights, Crystal Dynamics, Rareware and Retro Studios.