| Doomgriever | Developer | |
| Doomlaser | Developer | |
| Doomlord Interactive | Developer | |
| DoomsDay652 | Developer | |
| Doomsday Games | Developer | |
| Doomster | DeveloperPublisher | |
| DoonDookStudio | Developer | |
| Doooooom | Developer | |
| Door Jam Studios | Developer | |
| DoorHall | Developer | |
| Doot | Developer | |
| DootNStuff | Developer | |
| Dooyong | Publisher | |
| DopeyTaterChip | Developer | |
| Doppler Interactive | Developer | |
| DopplerFrog | Developer | |
| Doragon Entertainment | DeveloperPublisher | |
| Dorart | DeveloperPublisher | |
| Dorasu | DeveloperPublisher | |
| Dorblin7z7 | Developer | |
| Dordlebuns | Developer | |
| Dorfde | Developer | |
| Dorian SRed | Developer | |
| DorianTan | Developer | |
| DoritoThePug | Developer | |
| Dormir Não Dá XP Studio | Developer | |
| Dorovich | Developer | |
| Dorset Multimedia | DeveloperPublisher | |
| Dorthu | Developer | |
| Dose | Developer | |
| Dosei | Developer | |
| Dot Operator | Developer | |
| Dot Plan | DeveloperPublisher | |
| Dot32 | Developer | |
| DotEmu | DeveloperPublisher | |
| Dotemu | DeveloperPublisher | |
| Dotoyou | Developer | |
| Dotoyou Games | Developer | |
| Dotoyou Technology | Developer | |
| Dotto4213 | Developer | |
| Double Barrel Interractive | Developer | |
| Double Blubber Games (Official) | Developer | |
| Double Brain! | DeveloperPublisher | |
| Double Damage Games | DeveloperPublisher | |
| Double Dash Studios | Developer | |
| Double Diamond Sports | Developer | |
| Double Drive | DeveloperPublisher | |
| Double Eleven | DeveloperPublisher | |
| Double Fine | Developer | |
| Double Fine Productions | DeveloperPublisher | |
| Double Helix Games | Developer | |
| Double Helix Studios | Developer | |
| Double R. | Developer | |
| Double Sept | Developer | |
| Double Stallion | Developer | |
| Double Stallion Games | Developer | |
| DoubleCrown | Developer | |
| DoubleDeckerCheese | Developer | |
| DoubleDutch Games | Developer | |
| DoubleGlasses | Developer | |
| DoubleMoose | DeveloperPublisher | |
| DoubleSix | Developer | |
| DoubleTap Games | Developer | |
| DoubleTom | Developer | |
| DoubleVGames | Developer | |
| DoubleZeroOneZero | Developer | |
| Double_Darling_duo_deluxe | Developer | |
| Doublemoose Games | Developer | |
| Doublesix | Developer | |
| Doublesquare | Developer | |
| Doug Anderson | Developer | |
| Doug Barnett | Developer | |
| Doug Beeferman | Developer | |
| Doug Carlston | Developer | |
| Doug Carlston & Chris Jochumson | Developer | |
| Doug Cox | Developer | |
| Doug MacNeill | Developer | |
| Doug Matthews | Developer | |
| Doug Sharp | Developer | |
| Doug Thrower | Developer | |
| Doug Townley | Developer | |
| Doug Valenta | Developer | |
| Dougie mcg | Developer | |
| Douglas Adams | Developer | |
| Douglas Adams & Steve Meretzky | Developer | |
| Douglas Asted | Developer | |
| Douglas E. Smith | Developer | |
| DouglasKim | Developer | |
| Douglasian | Developer | |
| DoujinDev | Developer | |
| Douzane | Developer | |
| Dovahbilly | Developer | |
| Dove06 | Developer | |
| Dovely | Developer | |
| Doveon | Developer | |
| Dovetail Games | DeveloperPublisher | |
| Dovii | Developer | |
| Down to the Wire | Developer | |
| DownUnder | Developer | |
| DownVoteGames | Developer | |
| Downbeat Interactive | Developer | |
| Doyoufloss? | Developer | |
| Doz8u | Developer | |
| Doğukan Gözüm | Developer | |
| Dr B | Developer | |
| Dr Freeman | Developer | |
| Dr Picnic | Developer | |
| Dr. Agon | Developer | |
| Dr. Diode | Developer | |
| Dr. Ever | Developer | |
| Dr. Fortyseven | Developer | |
| Dr. Goop | Developer | |
| Dr. Leslie Grimm | Developer | |
| Dr. Locrian | Developer | |
| Dr. Ludos | Developer | |
| Dr. Phantom | Developer | |
| Dr. Whoop | Developer | |
| Dr. Wuro Industries | Developer | |
| Dr.XGB | Developer | |
| DrAwesomo | Developer | |
| DrBalou | Developer | |
| DrBlury | Developer | |
| DrBrick11 | Developer | |
| DrEvilBrain | Developer | |
| DrHurley | Developer | |
| DrIvingGame | Developer | |
| DrJedd | Developer | |
| DrManatee | Developer | |
| DrManticore | Developer | |
| DrMelon | Developer | |
| DrMike2000 | Developer | |
| DrMoistBread | Developer | |
| DrNeroCF | Developer | |
| DrNinja | Developer | |
| DrSKP | Developer | |
| DrSasquatch | Developer | |
| DrSensor | Developer | |
| DrTardigrade | Developer | |
| DrTeaSpoon | Developer | |
| DrZanuff | Developer | |
| Dr_Monkfish | Developer | |
| Dracau | Developer | |
| Dracino | Developer | |
| Dracir | Developer | |
| Drack Soft | DeveloperPublisher | |
| Draconis | Developer | |
| DraconisEquipe | Developer | |
| DraconisLupus | Developer | |
| Draconus Entertainment | DeveloperPublisher | |
| Dracue Software | Developer | |