| 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 | |