Northwest Software

NoSense

Novell

Novotrade Software Kft.

Appaloosa Interactive Corporation was a Hungarian game development studio founded by András Császár and Stephen J. Friedman. It was established in 1983 as Novotrade Software Kft. by 4 banks and 93 enterprises as a way to get hold of foreign currency, of which the supply was always low in the eastern bloc. The company also made computer programs and TV commercials. An office in California (USA) was also opened in 1983, possibly with the name Novotrade International LLC. When Hungary became a republic in October 1989 after shaking off the communist regime, the operations in Hungary and the USA were joined with the establishment of Novotrade International, Inc. In addition the name was changed to Appaloosa Interactive Corporation on 4th November 1996. In the nineties the company was especially known for creating games for SEGA consoles, most notably in the Ecco the Dolphin series. The company was closed in 2006.

NTIX Soft

Taff System (from Feb, 1990 to Mar, 2004) -- Former company name

OctagonSoft Inc.

Off The Wall Productions

Omega Integral Systems

Omnitrend Software, Inc.

Omnitrend Software, Inc. was founded by Thomas R. Carbone in 1979 and is a privately held business software company that branched out into computer game development during the 1980s. The company developed the three-game Universe series, Paladin, the Breach games, and two Rules of Engagement games.

OPeNBooK Co., Ltd.

OPeNBooK Co., Ltd. was a Japanese company founded in 1993 by Yoot Saito.

Optik Software, Inc.

Orange Games

Origin Systems Inc

Artificers of some of the greatest gaming franchises the world has ever known they are, and forever will be, scions of a golden age. We salute you, Origin. We salute you. Established in 1983, Origin (or Origin Systems) has become well known their Wing Commander, Ultima and Privateer titles. Acquired by Electronic Arts in the early 90's, Origin has recently been working on internet-only software, with the Ultima Online series.

ORT Software

ORT Software is the company name used by Owen Thomas to sell his independently-made games.

Outlaw

Ovine by Design

Oxford Softworks

Oxford Softworks is a development and publishing software house based in Buckinghamshire, England. Since the very birth of the leisure software industry, the company has been developing and publishing top quality games. They are well known in their field for producing software which possesses state of the art graphics, and the very strongest Artificial Intelligence response engines.

P. K. Winter

Pacific Gameworks

Paer J

Palace Software, Ltd.

Pandora

Panoramic Software

Paragon Software

Paragon Studios

Paragon Software Corporation or Paragon Studios were based in Pennsylvania. The company was established in 1985 and focused on licensed content from Marvel Comics.

Parker Brothers

Parker Brothers was first established in 1888 and remained family owned until 1968, when the company was purchased by General Mills. The company's first forays into electronic gaming came in the late 1970's and early 1980's, when they began to produce electronic versions of their popular board games.