| MM | Developer | |
| MM10 | Developer | |
| MM1R3 | Developer | |
| MMAndTheFunkyBunch | Developer | |
| MMEU | Developer | |
| MMGames&more | Developer | |
| MMM | Developer | |
| MMSPeep | Developer | |
| MMXXXVIII | Developer | |
| MMatos | Developer | |
| MNM Software | Developer | |
| MNT Software | Developer | |
| MNWS | Developer | |
| MOGRAFI | Developer | |
| MOKASON | Developer | |
| MOKKA | Developer | |
| MOKSHA GAME | Developer | |
| MONSTER MEOW STUDIOS | Developer | |
| MOONBIT | Developer | |
| MOPS Computer Systems | Developer | |
| MORITZ RULEZ | Developer | |
| MOSHA_NOZIK | Developer | |
| MOSS | DeveloperPublisher | |
| MOSS LTD | Publisher | |
| MOST STUDIOS | Developer | |
| MP Entertainment | DeveloperPublisher | |
| MP2 Games | DeveloperPublisher | |
| MPCA Interactive | DeveloperPublisher | |
| MPS Labs | Developer | |
| MQuero | Developer | |
| MRGZS1 | Developer | |
| MRgove10 | Developer | |
| MRwarlus | Developer | |
| MSG Manuel | Developer | |
| MSL | Publisher | |
| MSSNG | Developer | |
| MSTS 1: Kuju Entertainment | Developer | |
| MSX | Publisher | |
| MSX Club België | DeveloperPublisher | |
| MSX Computer Magazine | DeveloperPublisher | |
| MSX Files | Developer | |
| MSX Magazine | DeveloperPublisher | |
| MSXdev | Publisher | |
| MSio | Developer | |
| MTA Team | DeveloperPublisher | |
| MTDev | Developer | |
| MTK Software | DeveloperPublisher | |
| MTM Games | Publisher | |
| MTO | DeveloperPublisher | |
| MTOJP | Publisher | |
| MTV Games | Publisher | |
| MTV Games and Xbox Game Studios | Publisher | |
| MTV GamesNA | Publisher | |
| MTW | Developer | |
| MUCK GAMES | Developer | |
| MUGameGuild | Developer | |
| MUIFWEGO | Developer | |
| MUP Games | Developer | |
| MUT | Developer | |
| MUTAN | DeveloperPublisher | |
| MUYO | Developer | |
| MUZBOZ | Developer | |
| MVLN | Developer | |
| MVM Interactive | Publisher | |
| MVP Good Games Easy | Developer | |
| MVP Software | DeveloperPublisher | |
| MW Software | Publisher | |
| MWM Interactive | Publisher | |
| MWMDragon | Developer | |
| MWainwright | Developer | |
| MXT Games | Developer | |
| MYCOM | Publisher | |
| MYline media | Developer | |
| MZ-Dino | Developer | |
| Ma-Ba | Publisher | |
| MaXeKin | Developer | |
| MaXoMeR | Developer | |
| MaYa_DK | Developer | |
| MaanooAk | Developer | |
| Maarti | Developer | |
| Maboroshi Ware | Developer | |
| Mabs | Developer | |
| Mac Jones | Developer | |
| Mac Play | Developer | |
| MacDocBros | Developer | |
| MacDoom | Developer | |
| MacDue | Developer | |
| MacOfuGames | Developer | |
| MacPlay | DeveloperPublisher | |
| MacSpain | Developer | |
| MacacoPaulo | Developer | |
| Macadamia Soft | Developer | |
| Macgamestore | Publisher | |
| Machatin | Developer | |
| Machaulay | Developer | |
| Machination | DeveloperPublisher | |
| MachineGames | Developer | |
| MachineNun | Developer | |
| MachineStudios | Developer | |
| Machineboy | DeveloperPublisher | |
| Machinode | Developer | |
| MachoMuscles | Developer | |
| MaciWeather | Developer | |
| Maciej Bionicl Maj | Developer | |
| MaciejOsuch | Developer | |
| Mack | Developer | |
| Mackerel Interactive | Developer | |
| Macktimus | Developer | |
| Macmillan Digital Publishing | Publisher | |
| Macmillan Software | Publisher | |
| Macop | Developer | |
| Macoron | Developer | |
| Macrales Studio | Developer | |
| Macrocom Inc. | Publisher | |
| Macsen Software | Publisher | |
| Macshinen-Mensch | Developer | |
| Mad | DeveloperPublisher | |
| Mad Brokli | Developer | |
| Mad Catz | DeveloperPublisher | |
| Mad Catz Interactive | Publisher | |
| Mad CatzNA | Publisher | |
| Mad Cookies | Developer | |
| Mad Doc Software | Developer | |
| Mad Dog | Publisher | |
| Mad Dog Games | Publisher | |
| Mad Duck Productions | DeveloperPublisher | |
| Mad Fellows | Developer | |
| Mad Fellows Games | Developer | |
| Mad Gear Games | DeveloperPublisher | |
| Mad Genius Software | DeveloperPublisher | |
| Mad Hatter Software[11] | Publisher | |
| Mad J Studio | Developer | |
| Mad Katz | Publisher | |
| Mad Mimic | DeveloperPublisher | |
| Mad Mimic Interactive | DeveloperPublisher | |
| Mad Monkey | Developer | |
| Mad Monkey Games | Developer | |
| Mad Monkey Studio | Developer | |
| Mad Monster Games | Developer | |
| Mad Multimedia | Developer | |
| Mad Mushroom Games | Developer | |
| Mad Pangolin Games | Developer | |
| Mad Parrot Studios | Developer | |
| Mad monkey Studio | Developer | |
| MadBroxs | Developer | |
| MadDeviloper | Developer | |
| MadDuckGames | Developer | |
| MadFinn Development Co. | Developer | |
| MadGamesmith | Developer | |
| MadGearGames | Developer | |