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Ocean Software Ltd
Adventureland: Ocean
Odyssee
Adventureland: Odyssee
On-Line Systems
Adventureland: On-Line Systems
Origin
Titles, Adventureland, Origin, Underdogs: Origin Systems
Oxford Digital Enterprises
Adventureland: Oxford Digital Enterprises
Oxygen Interactive
Oxygen Interactive
Ominous Development
Developer of Onyx Star.
OmletteSoft, Home Of Omlette
Lord Omlette's personal homepage.
On-Line Entertainment
Publishers of Automayhem, Art of Kings, and Iron Wolves.
One Man Band
Gameboy Advance and Game Cube developer. Features portfolio and client list.
Ongame e-solutions
Developer of online poker games, using Java technology.
Oquirrh Productions
Developers of hunting, shooting and conservation games.
OTS Software
Developer of freeware, shareware, and inexpensive retail games, including card games, puzzles, first-person shooters.
Outsource Media
Offers computer games voice production in the UK, US. Services include casting, recording, post production, game developer services, and support.