Tvůrci her začínající znakem O

O-Games

O2 Online Entertainment Limited

O~3 Entertainment

Oase Software

Oasis Software

Oasys Mobile

Oberon Games

Oberon Media

ObjectFarm

Ocean Europe Limited

Ocean Media

Ocean of America

Ocean Software

Oceanhouse Media

Octagon Entertainment

Oddlabs ApS

Oddworld Inhabitants

Odesys

Odin Computer Graphics

Odin Software Development

Odyssia

Oetinger Interaktiv

Off Studio

Off the Wrist

Off Topic Productions

Office Asia Kenkyusho

OG International Limited

OG-Soft Productions

OGPlanet

Ohai

Ohio Distinctive Software

Ojom

OlderGames

Oldfield Interactive

OMEGA

Omega Integral Systems

Omega Micott

Omega Software

Omen Software

OMGPOP

OMK Software

Omni Systems

Omni Xtudio Pte

Omnisu

Omnitrend Software

OmNom Apps

Omori Electronics Corporation

Ompyxmmunications

On Deck Interactive

On Hand Software

On-Line Entertainment

On-Line PLC

On Line Software

On-Line Systems

One Man Left Studios

One Reality

One Stop Direct

OneBigGame

Onefog Games

Ongakukan,Ltd.

OnGames

OniGames

Onion Factory

ONLY4KIDS e.V.

Ontario Europe SA

oopdreams software

Opcode Games

Open Production

OPeNBooK

Opera House

Opera Soft

Opertoon

Opsive

Optik Software

Optima Software

Optimum Resource

Optimus Nexus

OPTIMUS Pascal

Optimus Pascal Multimedia

Optyk

Oracle Software Enr.

Orange Design

Orange France SA

Orange House

Orange Software

Orangepeel Softworks

Orbis Games

Orbital Media

Orca Corporation

Orca Multimedia

ORF Online und Teletext & KG

Organa

Organizações Globo SA

Organiza??es Globo SA

ORIGIN Systems

ORiGO GAMES

Orion Interactive

Orion Software

Orisinal

Orkus Software

Orneon

Orpheus

ORT Software

Orthodox

Osbourne/McGraw-Hill

Osem

Osmotic Studios

OSP Enr.

OTA A/S

Otaku Publishing

Oteeva Entertainment

OTM Publications & Promotions

OUAT Entertainment

OUEO Factory

Out of Pixels

Out of the Blue Software

Out of the Park Developments & KG

Outback Pty.

Outer Grid Games

Outerurt

Outlaw

Outrigger Koubou

Over the Top Games S.L.

Overland

Overloaded Pocket Media BV

Overpowered Games

Ovine by Design

Ovogame

Ovolo Corporation

Owl Cave

Owlchemy Labs

Ownage Studios

Oxeye Game Studio

Oxford Softworks

Oxiana Edizione

Oxygen Games

Oxygen Games USA

Oxygen Interactive

Oxygen Interactive Software

Oxylane

Oyaji Games

OZ Club

Ozacq1