Best game developers of ALL time?

[Veknoid_Outcast]

Number one is Nintendo EAD, by a wide margin. If that division is too big, I'll go with Nintendo R&D4 -> Kyoto Software Development No. 3.

Other great studios:

Team Ico/JAPAN Studio
Bungie Studios
Rare
Ubisoft Montpellier
Konami/Kojima Productions