| Mar Entertainment (Jose Manuel Alvarez, Manuel Matamoros, Juan Carlos Sanchez Alvarez) | Developer | |
| Mar'z Project | Publisher | |
| MarTCM | Developer | |
| MarWinStudios | Developer | |
| Marafrass | Developer | |
| Marama | Developer | |
| Maranara | Developer | |
| Marangon Productions | Developer | |
| Marasmusine | Developer | |
| MaratG2 | Developer | |
| Marav Stress | Developer | |
| MarbinSpectrum | Developer | |
| Marble | DeveloperPublisher | |
| Marc Arroyo | Developer | |
| Marc Blank | Developer | |
| Marc Goodman (as "Mangrove Earthshoe") | Developer | |
| Marc Gálvez | Developer | |
| Marc Jones | Developer | |
| Marc Romera Rodriguez | Developer | |
| Marc Serra | Developer | |
| Marc Steene | Developer | |
| MarcWerk | Developer | |
| Marcel Fischer | Developer | |
| Marcel Stocker | Developer | |
| Marcel Weyers | DeveloperPublisher | |
| MarcelSG | Developer | |
| MarcelinoB0rges | Developer | |
| Marcelo Chaves | Developer | |
| Marcelo Gomes | Developer | |
| Marcelo Miyazaki | Developer | |
| Marcelo Rigon | Developer | |
| Marcelod2 | Developer | |
| Marcial Lincoln | Developer | |
| Marcin Siwek | Developer | |
| Marck_Ello | Developer | |
| Marco Amadei | Developer | |
| Marco Bianchi | Developer | |
| Marco Cafe | Developer | |
| Marco Duroe | Developer | |
| Marco Giorgini | Developer | |
| Marco Marmolejos | Developer | |
| Marco Moroni | Developer | |
| Marco Paulo Carrasco | Developer | |
| Marco Stano | Developer | |
| Marco Zavaroni | Developer | |
| Marco98 | Developer | |
| MarcoElz | Developer | |
| MarcoR | Developer | |
| Marco_Massa_Dev | Developer | |
| Marcopole | Developer | |