List of abandonware publishers starting with O
Select a publisher to browse its games. You will have a list of the game this company published.
- O-Games, Inc.
- O.E.M., Inc.
- O~3 Entertainment
- Oase Software
- Oasis Software
- Oatmeal Software
- Oberon Media, Inc.
- Object Software Limited
- ObjectFarm
- Oblique Triad
- Obsessed Maniacs, The
- OCC
- Ocean Software Ltd.
- Océlo Interactive
- Octagon Entertainment, Inc.
- Oddlabs ApS
- Oddworld Inhabitants Inc.
- Odesta
- Odin 4000
- Odin Computer Graphics Ltd.
- Odin Software Development
- Odyssia
- Oetinger Interaktiv
- Office Asia Kenkyūsho
- OG International Limited
- OG-Soft Productions
- Ogólnopolska Fundacja Edukacji Komputerowej
- OIC Ltd.
- Okashi Studios, Inc.
- Okay
- OlderGames
- Olympia
- Olympia S.R.L.
- OMEGA
- Omega Integral Systems
- Omega Micott Inc.
- Omega Software
- Omega Software, Inc.
- Omen Software
- Omiya Soft, Co. Ltd.
- OMK Software
- OmniMedia (plc)
- Omnisoft
- Omnitrend Software, Inc.
- Omori Electronics Corporation
- Omric Corporation
- On Deck Interactive
- On Line Software
- On-Line Entertainment Ltd.
- On-Line PLC
- On-Line Systems
- On-Target Computing
- Once A Bird
- One Reality
- Onet.pl S.A.
- OnGames
- OnHand Software, Inc.
- OniGames
- Onimedia Sp. z o.o.
- Ontario Europe SA
- Onwa Computer Limited
- oopdreams software, inc.
- Open Mind World
- Open Production
- OPeNBooK Co., Ltd.
- OPeNBooK9003 inc.
- Openoko Entertainment
- Opera Soft S.A.
- Optik Software, Inc.
- Optima Software, Ltd.
- Optimum Resource, Inc.
- Optimus Nexus
- OPTIMUS Pascal
- Optimus Pascal Multimedia
- Optyk
- Optyx Software
- Oracle Software Enr.
- Orange House
- Orange Software
- Orangesoft
- Orator Games
- Orbit Gum
- Orca Corporation
- Orca Multimedia
- Organa LLC
- Organizações Globo SA
- Oriental Soft Japan
- Oriental Soft, Inc.
- ORIGIN Systems, Inc.
- Orion Interactive
- Orion Software, Inc.
- Orkus Software
- Orpheus Ltd
- ORT Software
- Osbourne/McGraw-Hill
- Osem
- Osiris Games
- Osis
- OSP Enr.
- Österreichische Bundesbahn
- Österreichisches Bundesheer
- OTA A/S
- Otaku Publishing, Ltd.
- Oteeva Entertainment
- OTM Publications & Promotions Ltd.
- OÜ Kvadrum
- Out of the Park Developments GmbH & Co. KG
- Outback Pty. Ltd.
- Outlaw
- Outline Multimedia GmbH
- Outrigger Koubou
- Over the Top Games S.L.
- Overflow Productions
- Overland Co., Ltd.
- Overload Entertainment
- Ovine by Design
- Oxford Computer Publishing Ltd.
- Oxford Softworks
- Oxiana Edizione
- Oxygen Interactive
- Oxygen Interactive Software Ltd.
- OZ Club
- Ozacq1, Inc.
- Ozi Soft Pty Ltd
