| SleepingTitan | Developer | |
| Sleepless Clinic | Developer | |
| Sleepless Inc. | Developer | |
| Sleepless Knights | Developer | |
| Sleepless Seven | Developer | |
| Sleeprunner Studios | Developer | |
| Sleepy Agents | Developer | |
| Sleepy Dragon | Developer | |
| Sleepy Dreamer | Developer | |
| Sleepy Sora | Developer | |
| Sleepy Studios | Developer | |
| SleepyPlayer16 | Developer | |
| SleepyTom | Developer | |
| Sleepy_Peach_Tea | Developer | |
| Sleth | Developer | |
| Sliceandrice | Developer | |
| Slick Entertainment | Developer | |
| Slick Games | Developer | |
| Slider Games | Developer | |
| Slightly Mad Studios | Developer | |
| SlightlyMadman | Developer | |
| SlightlyOddGames | Developer | |
| SlightlySimple | Developer | |
| Slime Games | Developer | |
| Slime Soft | DeveloperPublisher | |
| Slime103 | Developer | |
| SlimeBOOS | Developer | |
| SlimeFaceGames | Developer | |
| SlimeMaid 💧🎀 | Developer | |
| Slime_Cubed | Developer | |
| SlimsyPlayer | Developer | |
| SlimyMelon | Developer | |
| Slip | Developer | |
| Slipgate Ironworks | Developer | |
| Slipgate Studios | Developer | |
| Slitherine | DeveloperPublisher | |
| Slitherine Games | DeveloperPublisher | |
| Slitherine Software | DeveloperPublisher | |
| Slitherine Strategies | Developer | |
| Slitherline Software | Publisher | |
| Slo Nod | Developer | |
| SloaneRisette | Developer | |
| Sloclap | Developer | |
| Slogo | Developer | |
| SlomJr | Developer | |
| Sloppy Joe Studios | Developer | |
| Sloppy Studios | Developer | |
| SlothDevLlama | Developer | |
| SlothGamesCo | Developer | |
| Slothzilla Games | Developer | |
| Slow Seer | Developer | |
| SlowNibbler | Developer | |
| SlowSavitar | Developer | |
| SlowTom | Developer | |
| Slowed Minds | Developer | |
| Slowglass (Manuel Dominguez Zaragoza, Alberto Perez Torres, Pablo Toledo Cota) | Developer | |
| Slowpoke | Developer | |
| Slowpokes.Design | Developer | |
| Sloyd | Developer | |
| Slug Disco | Developer | |
| Sluggy | Developer | |
| SlugyTinky Entertainment | Developer | |
| SlurpeeThief | Developer | |
| SlurpyTurnip | Developer | |
| Slushy_ | Developer | |
| SluttySlug77 | Developer | |
| SlyBalto | Developer | |
| SlyLord | Developer | |
| Slyfincleton | Developer | |
| Slyka | Developer | |
| Slyon Studios | DeveloperPublisher | |
| Slyonics | Developer | |
| Slyse | Developer | |
| SmSholom | Developer | |
| Smac Games | Developer | |
| Smack Down Productions | Developer | |
| Smackdown Productions | Developer | |
| Smaex | Developer | |
| Small Rockets | DeveloperPublisher | |
| Small Scope Studio | Developer | |
| Small is Beautiful | Developer | |
| SmallBu | Developer | |
| SmallChickenSun | Developer | |
| SmallFolk | Developer | |
| SmallPhil | Developer | |
| SmallTestAccount | Developer | |
| Smallstudio | Developer | |
| Smally Mouse | Developer | |
| Smart Bomb Interactive | Developer | |
| Smart Dog | Developer | |
| Smart Dog Games | Developer | |
| Smart Egg Software | Developer | |
| Smart Egg Software (Nigel Brooks, Said Hassan, Ross Harris) | Developer | |
| Smart Egg Software (Ron Harris, Nigel Brooks, Said Hassan, Ross Harris) | Developer | |
| Smart Potatoe | Developer | |
| SmartWizard | Developer | |
| Smartdog | Developer | |
| Smarter Games | Developer | |
| Smartphone Labs | Developer | |
| Smash Cooper | Developer | |