| GammaGames | Developer | |
| Gammactic | Developer | |
| Gammed Jame | Developer | |
| Gammelsaeterg | Developer | |
| Gammera Nest | Developer | |
| Gammick Entertainment | DeveloperPublisher | |
| Gamoola Soft | Developer | |
| Gamos Ltd. | DeveloperPublisher | |
| Gampixi | Developer | |
| Gamplis | Developer | |
| Gamujan | Developer | |
| Gamux | Developer | |
| Gan_HOPE326 | Developer | |
| Ganadriel | Developer | |
| Ganbare Games | Developer | |
| Ganbarion | Developer | |
| Gandoulf | Developer | |
| Gang of Five | Developer | |
| Gang of Five (Andy Green, Martin Wheeler) | Developer | |
| Gang of Five (Andy Green, Martin Wheeler, Simon Butler) | Developer | |
| Gang of Five (Dave B Chapman, Martin Wheeler) | Developer | |
| Ganiester | Developer | |
| Gannon Designs (Steve Marsden | Developer | |
| Gao Ming | Developer | |
| Gaohmee | Developer | |
| Gaps | DeveloperPublisher | |
| Gaps Inc. | Publisher | |
| GapsJP | Publisher | |
| Gapti | Developer | |
| Garaco | Developer | |
| Garage 227 Studios | DeveloperPublisher | |
| Garage Monkey Studio | Developer | |
| GarageGames | DeveloperPublisher | |
| Garage_Heathen | Developer | |
| Garbage Games | Developer | |
| Garbochii Games | Developer | |
| Gardenfaerie | Developer | |
| Gardensoft (claimed) Your Sinclair | Publisher | |
| Garenz | Developer | |
| Gareth Baker | Developer | |
| Gareth J Briggs | Developer | |
| Gareth J. Briggs | Developer | |
| Gareth Williams | Developer | |
| GarethDev | Developer | |
| Garfilth | Developer | |
| Garfybold | Developer | |
| Gargantus | Developer | |
| Gargoyle Games | Publisher | |
| Gargoyle Games (Greg Follis, Roy Carter) | Developer | |
| Gargoyle Games (Jas C. Brooke) | Developer | |