| Simon Gigant | Developer | |
| Simon Golding | Developer | |
| Simon Herfert | Developer | |
| Simon Hobbs | Developer | |
| Simon Hutchinson | Developer | |
| Simon JC Davies | Developer | |
| Simon K. Overy | Developer | |
| Simon Kaley | Developer | |
| Simon Micro-Soft (Clive Brooker) | Developer | |
| Simon Munnery | Developer | |
| Simon Price | Developer | |
| Simon Street | Developer | |
| Simon Stålhandske | Developer | |
| Simon Valdemar Weber | Developer | |
| Simon W Hessel | Developer | |
| Simon Wadsworth | Developer | |
| Simon Welland | Developer | |
| Simon White | Developer | |
| SimonCurtis | Developer | |
| SimonHoffiz | Developer | |
| SimonJacobsen | Developer | |
| SimonLoko | Developer | |
| SimonOlivecrona | Developer | |
| SimonTS | Developer | |
| SimonTranArt | Developer | |
| Simona Maiorano | Developer | |
| Simondtd | Developer | |
| Simone Cicchetti | Developer | |
| Simone Guggiari | Developer | |
| Simonelmono | Developer | |
| Simonotos | Developer | |
| Simpathey | Developer | |
| Simple Bit Games | Developer | |
| Simple Ghost | Developer | |
| SimpleTeam | Developer | |
| SimplefullLab | Developer | |
| Simpleton | Developer | |
| Simplewd Games | Developer | |
| SimplexCode | Developer | |
| Simplify | Developer | |
| Simply-Sardines | Developer | |
| Simplyunstopable | Developer | |
| Sims | DeveloperPublisher | |
| Sims Limited | Developer | |
| Simsalabim Software | DeveloperPublisher | |
| Simsquared Ltd. | Publisher | |
| Simtex | Developer | |
| Simulated Environment Systems | Developer | |
| Simulations Canada | DeveloperPublisher | |
| Simulmondo | DeveloperPublisher | |
| Simutek Software | Publisher | |
| Simutrek Inc. | Publisher | |
| Simutronics Corporation | Developer | |
| SinSisters | Developer | |
| SinaHofmann | Developer | |
| SinanVanli | Developer | |
| Sinathor | Developer | |
| Sinclair Research | Publisher | |
| Sinclair Research Ltd | Publisher | |
| SinclairStrange | Developer | |
| Sindi Breshani | Developer | |
| Sinest Ltd. | Developer | |
| Singapore-MIT GAMBIT Game Lab | Developer | |
| Single Dad Games | Developer | |
| Single Sapling Games | Developer | |
| Single Trac | Developer | |
| SingleAProductions | Developer | |
| SingleFarama | Developer | |
| SingleMindedRyan | Developer | |
| SingleTrac | Developer | |
| Singlecore Games | DeveloperPublisher | |
| SingularityGD | Developer | |
| Sinister Cyclops | DeveloperPublisher | |
| Sinister Cyclops Game Studios | DeveloperPublisher | |
| Sinister Games | Developer | |
| Sinister Twist Games | Developer | |
| Sink | Developer | |
| Sinking Sheep | Developer | |
| Sinnesloeschen Games | Developer | |
| Sinnia | Developer | |
| Sinoc | Developer | |
| Sinople | Developer | |
| Sintel | Developer | |
| Siobhan Gibson | Developer | |
| SipS0p | Developer | |
| Sipho | Developer | |
| Sir Cristian Docampo | Developer | |
| Sir Florpindorpin | Developer | |
| Sir Geoffers | Developer | |
| Sir Hatsley | Developer | |
| Sir Kovitch | Developer | |
| Sir Magic | Developer | |
| Sir Mustach.io | Developer | |
| Sir Oussman | Developer | |
| Sir TapTap | Developer | |
| Sir-Tech | DeveloperPublisher | |
| Sir-Tech Canada | Developer | |
| Sir-tech | DeveloperPublisher | |
| Sir. Lumpsalot | Developer | |
| SirBernhart | Developer | |