| Cyanide Studio | Developer | |
| Cyanide Studios | Developer | |
| Cyanide Tea | Developer | |
| CyanidePanda | Developer | |
| Cyaygel | Developer | |
| Cybadyne (Christian F. Urquhart, Mike Smith) | Developer | |
| Cybee | Developer | |
| Cybele Productions | DeveloperPublisher | |
| Cybelle | DeveloperPublisher | |
| Cyber Chroma | Developer | |
| Cyber Front | DeveloperPublisher | |
| Cyber Group Studios | Developer | |
| Cyber Insidious | Developer | |
| Cyber Planet Interactive | Developer | |
| Cyber Rhino Studios | DeveloperPublisher | |
| Cyber Twilight | Developer | |
| CyberApex | Developer | |
| CyberCoder | Developer | |
| CyberConnect2 | DeveloperPublisher | |
| CyberDoesStuff | Developer | |
| CyberForte | Developer | |
| CyberFront | DeveloperPublisher | |
| CyberFront Corporation | Publisher | |
| CyberFrontJP | Publisher | |
| CyberFrontKO | Publisher | |
| CyberGunk | Developer | |
| CyberLab Studios | Developer | |
| CyberPRDX | Developer | |
| CyberPlanet Interactive | Developer | |
| CyberStep | DeveloperPublisher | |
| CyberTobie | Developer | |
| CyberVision | Developer | |
| Cyberbee | Developer | |
| Cyberconnect2 | Developer | |
| Cyberdreams | DeveloperPublisher | |
| Cyberdyne Systems | Developer | |
| Cyberekt | Developer | |
| Cyberevolver_Studios | Developer | |
| Cyberflix | DeveloperPublisher | |
| Cyberfly | Developer | |
| Cyberfront | DeveloperPublisher | |
| Cyberfront Corporation | Publisher | |
| Cyberfront Korea | Developer | |
| Cyberfront Korea Corporation | Publisher | |
| Cybergnose Café | Developer | |
| Cyberius Dei | Developer | |
| Cyberlore Studios | Developer | |
| Cybernate | Developer | |
| Cybernetic Corporation | Developer | |
| Cybernetic Walrus | Developer | |
| CyberneticWalrus | Developer | |
| Cyberpan | Developer | |
| Cyberq | Developer | |
| Cyberslav | Developer | |
| Cybersoft | Publisher | |
| CybertaleProductions | Developer | |
| Cybertech | Developer | |
| Cybertech Custom | DeveloperPublisher | |
| Cybertech Designs | DeveloperPublisher | |
| Cyberus Studio | Developer | |
| Cybervision | Publisher | |
| CyborgCity | Developer | |
| CyborgJack | Developer | |
| Cyclone | Developer | |
| Cyclone (David Whitehouse, Stephen Lockley, Adrian Carless) | Developer | |
| Cyclone Games Inc. | Developer | |
| Cyclone Studios | DeveloperPublisher | |
| Cyclone System | Developer | |
| Cyclone Zero | Developer | |
| Cyclone35Jokesays | Developer | |
| Cygames | DeveloperPublisher | |
| Cygnus Inc. | Developer | |
| Cygnus Multimedia | DeveloperPublisher | |
| Cygnus Software | DeveloperPublisher | |
| Cygnus Software (Des O'Toole, Cheryl) | Developer | |
| Cygnus Studios | Developer | |
| Cygnus Void | Developer | |
| Cykelero | Developer | |
| Cykyrios | Developer | |
| CylinderBox | Developer | |
| CynBits | Developer | |
| Cynabun | Developer | |
| Cynapse | Developer | |
| CynchieMuchiru | Developer | |
| CyndaquilDAC | Developer | |
| Cyndi4U | Developer | |
| Cynthia | Developer | |
| Cynthia van Hees | Developer | |
| Cynus | Developer | |
| Cyparade | Developer | |
| Cypress | Developer | |
| Cypron Studios | Developer | |
| Cypronia | DeveloperPublisher | |
| Cyreides | Developer | |
| Cyril Li | Developer | |
| Cyrogem | Developer | |
| CyrolisDev | Developer | |
| Cyrus Yip | Developer | |
| CyrusVirothian | Developer | |
| Cythera | Developer | |
| 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 | |