On-Line Entertainment Publishers of Automayhem, Art of Kings, and Iron Wolves. http://www.on-line.co.uk/

OmletteSoft, Home Of Omlette Lord Omlette's personal homepage. http://www.omlettesoft.com/

Ominous Development Developer of Onyx Star. http://ominousdev.tripod.com

Oquirrh Productions Developers of hunting, shooting and conservation games. http://www.oquirrh.com/

Outsource Media Offers computer games voice production in the UK, US. Services include casting, recording, post production, game developer services, and support. http://www.omuk.com/

Ongame e-solutions Developer of online poker games, using Java technology. http://www.ongame.com/

One Man Band Gameboy Advance and Game Cube developer. Features portfolio and client list. http://www.onemanband.com/

OTS Software Developer of freeware, shareware, and inexpensive retail games, including card games, puzzles, first-person shooters. http://www.otssoftware.com/

Natsume Official site. Includes news, game information, and screenshots. http://www.natsume.com/