| 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 | |
| XING | 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 | |
| XPromus | Developer | |
| XRNZ | Developer | |
| XS Games | DeveloperPublisher | |
| XS Games, LLC | Publisher | |
| XS GamesEU,NA | Publisher | |
| XS GamesNA | Publisher | |
| XSEED | Developer | |
| XSEED GamesNA | Publisher | |
| XStables | Developer | |
| XTOPY | Developer | |
| XXXTenTesticles | Developer | |
| XXpoomaanXX | Developer | |
| XXv Productions | DeveloperPublisher | |
| XYZ | DeveloperPublisher | |
| XYZ Productions | Developer | |
| X_Games | Developer | |
| X_games | Developer | |
| Xack22 | Developer | |
| Xain | DeveloperPublisher | |
| Xain Soft | DeveloperPublisher | |
| Xak | Developer | |
| Xalavier Nelson Jr. | Developer | |
| Xaloc Studios | Developer | |
| Xalomango | Developer | |
| Xalph555 | Developer | |
| Xand | Developer | |
| Xander | Developer | |
| Xander Wardell | Developer | |
| XanderHD | Developer | |
| Xanderwood | Developer | |
| Xandes66 | Developer | |
| Xandir | Developer | |
| XandroGame | Developer | |
| Xangotrick | Developer | |
| Xanjos | Developer | |
| Xankill3r | Developer | |
| Xantera | Developer | |
| Xanth Software | Developer | |
| Xanthus | Developer | |
| Xanz | Developer | |
| XardoX | Developer | |
| Xarian Okean | Developer | |
| Xaruto | Developer | |
| Xascoria | Developer | |
| Xatrix | Developer | |
| Xatrix Entertainment | Developer | |
| Xavi Lucena | Developer | |
| Xavi Smith | Developer | |
| Xaviant | DeveloperPublisher | |
| Xavid | Developer | |
| Xavier Belanche | Developer | |
| Xavier Ekkel | Developer | |
| Xavier Orion Games | DeveloperPublisher | |
| Xboite720 | Developer | |
| Xbox Game Studios | DeveloperPublisher | |
| Xbox Game Studios Japan | Developer | |
| Xbox Games Studio | Publisher | |
| Xcrypt | Developer | |
| XeaKK | Developer | |
| Xeen | Developer | |
| Xeethrax | Developer | |
| Xelart game studio | Developer | |
| Xelostar | Developer | |
| Xen | Developer | |
| Xen Games | Developer | |
| Xenation | Developer | |
| Xendex | Developer | |
| Xeneth | Developer | |
| Xenix Dev | Developer | |
| XenoHorizon | DeveloperPublisher | |
| XenoRocket | Developer | |
| Xenomoo | Developer | |
| Xenon | Developer | |
| Xenon Interactive | Developer | |
| Xenon Neko | Developer | |
| XenonGhost | Developer | |
| Xenoneo | Developer | |
| XenosNS | Developer | |
| Xenoxygene | Developer | |
| Xenvex | Developer | |
| Xeonadow | Developer | |
| Xephrys | Developer | |
| XerStudios | Developer | |
| Xerise | Developer | |
| XeroKimo | Developer | |
| Xerquay | Developer | |
| Xerra | Developer | |
| Xerxes | Developer | |
| Xevinaly | Developer | |
| Xexus | Developer | |
| XeyCreatorsClub | Developer | |
| Xfinge | Developer | |
| XformGames | Developer | |
| Xgor | Developer | |
| Xhems | Developer | |
| Xhin | Developer | |
| XiNFiNiTY Games | Developer | |
| Xibalba | Developer | |
| Xicat Interactive | Publisher | |
| Xicat Interactive, Inc. | Publisher | |
| Xicat InteractiveEU | Publisher | |
| Xicat InteractiveNA | Publisher | |
| Xicat InteractivePAL | Publisher | |
| Xider Games | Publisher | |
| Xientra | Developer | |
| Xieyubing123 | Developer | |
| XiferGames | Developer | |
| Xilam | DeveloperPublisher | |
| Xillidonno | Developer | |
| XimioniLabs | Developer | |
| Ximo | Developer | |
| Ximpa | Developer | |
| Ximsol182 | Developer | |
| Xiness | DeveloperPublisher | |
| Xing | DeveloperPublisher | |
| Xing Entertainment | DeveloperPublisher | |
| Xing Inc. | Developer | |
| Xintetsu | Developer | |
| Xinyu Miao | Developer | |
| Xionviel | Developer | |
| Xiperius | Developer | |
| Xiris | Developer | |
| Xitilon | DeveloperPublisher | |
| Xixo Game Studio | DeveloperPublisher | |
| Xkeeper | Developer | |
| Xochi Interactive | Developer | |
| Xocolatl Games | Developer | |
| Xona Games | DeveloperPublisher | |
| Xondaro | Developer | |
| Xonha | Developer | |
| Xortrapa Soft | Publisher | |
| Xortrapa Soft (Julian Alarcon, Alberto Blanco, Joaquib, Abdul, Alex Gutierrez) | Developer | |
| XpAlliance | Developer | |
| Xpec | Developer | |
| Xpec Entertainment | Developer | |
| Xpiral | Developer | |
| Xplosiv | DeveloperPublisher | |
| XplosivEU | Publisher | |
| XplosivPAL | Publisher | |
| XrespectadripX | Developer | |
| XryEcho | Developer | |
| Xsco Games | Developer | |
| Xseed Games | DeveloperPublisher | |
| Xseed GamesNA | Publisher | |
| Xslash | Developer | |
| Xtalsoft | DeveloperPublisher | |
| Xtreme Games | Developer | |
| Xtreme Games LLC | Publisher | |
| Xtreme Prime | Developer | |
| XtremeZero | Developer | |