| DDD Wares | Developer | |
| DDL, Inc. | Developer | |
| DDR | Developer | |
| DDRKirby(ISQ) | Developer | |
| DDevilfish | Developer | |
| DDreamsGames | Developer | |
| DE Team | Developer | |
| DEANER | Developer | |
| DEATH | Developer | |
| DECBAAH | Developer | |
| DECO | Publisher | |
| DECO (JP) | Publisher | |
| DEEV Interactive | Developer | |
| DEFICIENCY PRODUCTIONZ | Developer | |
| DEFɅCID | Developer | |
| DEMBERG | Developer | |
| DENEDI | Developer | |
| DESTROYER3 | Developer | |
| DEVBOX | Developer | |
| DEVCHAT | Developer | |
| DEVHOUR GAMES | Developer | |
| DEVastationStudio | Developer | |
| DEvalen200 | Developer | |
| DExUS5 | Developer | |
| DGMKPixy | Developer | |
| DGPS Arts & Crafts | Developer | |
| DGS Software | Developer | |
| DGSpitzer | Developer | |
| DH | Developer | |
| DHM Interactive | Publisher | |
| DI EXPLOITATION | Developer | |
| DICE | Developer | |
| DICO | Publisher | |
| DIMensionNEW | Developer | |
| DINOSAURSSSSSSSS | Developer | |
| DIelph | Developer | |
| DJ | Developer | |
| DJ Burt | Developer | |
| DJ Mindar | Developer | |
| DJALFA Devs | Developer | |
| DJBatz | Developer | |
| DJL Software (David J Looker, David Whittaker) | Developer | |
| DJL Software (David J Looker, John Looker) | Developer | |
| DJL Software (David J. Looker) | Developer | |
| DJNOSTYLE (Selebus) | Developer | |
| DJonesArt | Developer | |
| DJtheGameMaker | Developer | |
| DK | Developer | |
| DK Games | Developer | |
| DK'Tronics | Publisher | |