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1. Valve (pitch perfect, every time, the Gamers' developer)
2. Bullfrog (a string of fantastic games before they got borged by EA)
3. Looking Glass (Thief and System Shock 1 and 2. Talk about pioneering)
4. Creative Assembly (I've lost more time to the various Total War games than just about anything else put together)
5. Bioware (mainly for their early stuff. Hopefully, Dragon Age will see a return to their top form)