| Name | Types | |
|---|---|---|
| Wyvex | Developer | |
| Wzqxrys | Developer | |
| X | Developer | |
| X Games | Developer | |
| X Plus | Developer | |
| X Shitei Brand | Developer | |
| X Software | DeveloperPublisher | |
| X Woomy | Developer | |
| X and Z Productions | Developer | |
| X-Ample Architectures | Developer | |
| X-E-A | Developer | |
| X-Eleven Games | Developer | |
| X-Nauts | Publisher | |
| X-NautsKO | Publisher | |
| X-Ray Interactive | Developer | |
| X-Stream Digital | Developer | |
| X-Ways | DeveloperPublisher | |
| X-ample | Developer | |
| X-ample Architectures | Developer | |
| X-bow Software | Developer | |
| X-ray | Developer | |
| X.D. Network | DeveloperPublisher | |
| X2Sたr | Developer | |
| X3R9 | Developer | |
| X4 Games | Developer | |
| XAIN | Publisher | |
| XAND | Developer | |
| XAV | Developer | |
| XCROWE | Developer | |
| XCVG | Developer | |
| XCVZXC | Developer | |
| XCreator Minigames | Developer | |
| XDEV | Developer | |
| XDennisZero | Developer | |
| XDev | Developer | |
| XENVITA | Developer | |
| XGen Studios | DeveloperPublisher | |
| XI-ART | Developer | |
| XIMPLE APPS | Developer | |
| Publisher | ||
| XING Entertainment | Publisher | |
| XIX: Boy Band Simulator | Developer | |
| XM7md | Developer | |
| XMPTGames | Developer | |
| XNBlank | Developer | |
| XOR Corporation | DeveloperPublisher | |
| XPEC | Developer | |
| XPEC Entertainment | DeveloperPublisher | |
| XPEC Entertainment Inc. | Developer | |
| XProductions | Developer |