Companies

• Outrage Games
• Outright Games
• OverBorder Studio
• OverGamez
• Overhype Studios
• Overkill Software
• Oversight Productions
• Over The Moon
• Over the Top Games
• Ovosonico
• Owen Deery
• Owlcat Games
• Owl Cave
• Owlchemy Labs
• Owlient
• Owl Studio
• Owned by Gravity
• Oxeye Game Studio
• Oxford Digital Enterprises Ltd
• Oxford Softworks
• OXiAB Game Studio
• Oxide Games
• Oxygene Media
• Oxygen Games
• Oxygen Studios
• Oxymoron Games
• Ozark Softscape
• P2 Entertainment
• Pacific Novelty
• Pack-In-Video