| 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 | |
| DK'tronics | DeveloperPublisher | |
| DK-Games | Developer | |
| DMA Design | Developer | |
| DMA Design (Jonathan Dye, Gary Timmons, Tiny Williams) | Developer | |
| DMA Design Limited | Developer | |
| DMGregory | Developer | |
| DMLabs | Developer | |
| DMM Games | DeveloperPublisher | |
| DMP Productions | Developer | |
| DMVortex | Developer | |
| DNC Entertainment | DeveloperPublisher | |
| DNCGAMES | Developer | |
| DNPidgey | Developer | |
| DOMO | Developer | |
| DOOBIC Entertainment | Developer | |
| DORASU | Publisher | |
| DOT | Developer | |
| DOTT Plan | DeveloperPublisher | |
| DOVEANE | Developer | |
| DPS2004 | Developer | |
| DPandaHeart | Developer | |
| DPhan Design | Developer | |
| DR Studios | Developer | |
| DR papyrus | Developer | |
| DRACHEVSKY | Developer | |
| DRAGOLITE | Developer | |
| DRAGOONERGAMES | Developer | |
| DRAX109 | Developer | |
| DREAM ON STUDIO | Developer | |
| DREW STILLWELL | Developer | |
| DROM studio Incorporation | Developer | |
| DSA | Developer | |
| DSF100 | Developer | |
| DSGA2016 | Developer | |
| DSI Games | DeveloperPublisher | |
| DSI GamesJP | Publisher | |
| DSI GamesNA | Publisher | |
| DSK Green Ice Games | DeveloperPublisher | |
| DStroid | Developer | |
| DT Mark | Developer | |
| DTF Games | Developer | |
| DTGames Entertainment | Developer | |
| DTMC | Publisher | |
| DTMC (NA) | Publisher | |
| DTMC NA | Publisher | |
| DTP Entertainment | DeveloperPublisher | |
| DTP EntertainmentEU | Publisher | |
| DTP Young Entertainment | Publisher | |
| DTheriot | Developer | |
| DU&I | Developer | |