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Developers
Orlesh
Orneon
Ornilo Games
Ornith
Orochii Zouveleki
Orontes Games
Oroshibu
Orphic Games
Orphic Software
Orsonik's Studio
Orteil
Orthogonal Games
Orthros
Orthrus Studios
Orube Game Studio
Oruji Productions
Oryx Design Lab
OsCoorp Games
Osarion
Osarion & Mountaineer
Osaris Games
Osborne Games
Oscar "Ratvader" Rydelius
Oscar Brittain
Oscar Brock
Oscar Celestini
Oscar Crespo
Oscar Gonzalez
Oscar Sanchez
Osgoode Media