| Dumb Bear Studios | Developer | |
| Dumdodoor | Developer | |
| Dumivid | Developer | |
| Dummy Dojo | Developer | |
| Duna Games | Developer | |
| Dunbar Games | Developer | |
| Duncan Alexander | Developer | |
| Duncan Brown software | Publisher | |
| Duncan Idaho | Developer | |
| Duncan MacDonald | Developer | |
| Duncan Sinclair | Developer | |
| Dune Studio | Developer | |
| DuneWorld | Developer | |
| Dungeon Dwellers Design | Developer | |
| Dungeon Engineer | Developer | |
| Dungeon Entertainment | Publisher | |
| Dungeon of Zaar | Developer | |
| DungeonCrafter | Developer | |
| DungeonMaster_Marty | Developer | |
| DungeoneerDigital | Developer | |
| Dungeonmir | Developer | |
| Dungeons And Rockets | Developer | |
| DungeonsandDadJokes | Developer | |
| Dunkaccino | Developer | |
| DunkelBlume | Developer | |
| Dunster | Developer | |
| Duobix | Developer | |
| Duoplus Software | Developer | |
| Duoxy | Developer | |
| Dupat | Developer | |
| Dupuis | Developer | |
| Dupy | Developer | |
| Duque | Developer | |
| Duranik | DeveloperPublisher | |
| Durbek Nuritdinov | Developer | |
| Durbo | Developer | |
| Durell | Publisher | |
| Durell Software | DeveloperPublisher | |
| Durell Software (Mike A. Richardson) | Developer | |
| Durnathi | Developer | |
| Durz32 | Developer | |
| Dusenberry Martin Racing | Developer | |
| Dushi | Developer | |
| Dusk | Developer | |
| DuskedSky | Developer | |
| Dusko Dimitrijevic | Developer | |
| Dust Scratch Games | Developer | |
| Dustin Auxier | Developer | |
| Dustin Gunn | Developer | |
| Dustin Halsey | Developer | |