| Name | Types | |
|---|---|---|
| Cytherean Adventures | Developer | |
| Cytopia | Developer | |
| Cz_Bozn | Developer | |
| Czaruk | Developer | |
| Czester16 | Developer | |
| C² Bros Import | Publisher | |
| C² World | Publisher | |
| D Cruise | Developer | |
| D CruiseJP | Publisher | |
| D Deans | Developer | |
| D I S C O Z O N E | Developer | |
| D Richards | Developer | |
| D!EMONIC | Developer | |
| D&H Games | Publisher | |
| D' India | Developer | |
| D'Andrëw Box | Developer | |
| D'Avekki Studios | Developer | |
| D'India Software | DeveloperPublisher | |
| D'oven | Developer | |
| D's Garage 21 | Developer | |
| D-1000 Project | Developer | |
| D-CELL GAMES | Developer | |
| D-Designs | Developer | |
| D-O | DeveloperPublisher | |
| D-Pad Studio | DeveloperPublisher | |
| D-Project | Developer | |
| D-Rockets | Developer | |
| D-Studios | Developer | |
| D-Train1988 | Developer | |
| D-cruise | Developer | |
| D-tergent | Developer | |
| D. Aron | Developer | |
| D. Deschamps Magnetiques | Developer | |
| D. H. Ibbotson | Developer | |
| D. M. Moore | Developer | |
| D. Master | Developer | |
| D. Pavlovsky | Developer | |
| D. Zenith | Developer | |
| D.C. Studios Inc. | Developer | |
| D.C. True | Developer | |
| D.E.X Team | Developer | |
| D.O. Corp | DeveloperPublisher | |
| D.O. Corp. | DeveloperPublisher | |
| D0UBLEJUMP | Developer | |
| D0ddisuper | Developer | |
| D0nu7 | Developer | |
| D1GITΛL CVTS | Developer | |
| D2C Games | DeveloperPublisher | |
| D2D Games | Developer | |
| D3 | DeveloperPublisher |