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Publishers
Origin Systems
Origin8
Original Fire Games
Original Gamer 8A8A
Original Plan
Orihaus
Oriol Cosp Games
Oriolus Software GmbH
Orion Games
Orion Interactive
Orion Software, Inc.
OrionSoft
OrionStudios
Orionark Games
Oriseus Studios
Orius Games
Orlitronic
Ornilo Games
Oro Interactive
Orochii Zouveleki
Orontes Games
Orpheus Ltd
Orphic Games
Orphic Software
Orsonik's Studio
Orteil
Orthogonal Games
Orthros
Orube Game Studio
Oruji Productions