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Developers
Oriental Software
Origami Sword
Origaming Media
Origin
Origin Systems
Origin8
Original Fire Games
Original Gamer 8A8A
Original Games
Original Plan
Original Studios
Original Workshop Company Limited
Originator
Orihaus
Oriol Cosp Games
Oriolus Software GmbH
Orion
Orion Belt Games
Orion Games
Orion Interactive
Orion Software, Inc.
Orion Technologies
OrionSoft
OrionStudios
Orionark Games
Oriplay
Oriseus Studios
Orisinal
Orius Games
Orlando