| New free MMOs in September 2011: | ||
 Tank Ace International Release: Open Beta – September 1, 2011 Subgenre: TPS Publisher: GamesCampus Developer: B.O.B Studio |
 Firefall International Release: Closed Beta – September 2, 2011 Subgenre: FPS Publisher: Red 5 Studios Developer: Red 5 Studios |
 R2 Online International Release: Pre-Closed Beta – September 7, 2011 Subgenre: CRPG Publisher: Webzen Developer: Webzen |
 Rise of the Immortals International Release: Live – September 12, 2011 Subgenre: RTS Publisher: Petroglyph Games Developer: Petroglyph Games |
 Rusty Hearts International Release: Open Beta – September 13, 2011 Subgenre: Brawler Publisher: Perfect World Entertainment Developer: Stairway Games |
 Luvinia Online International Release: Live – September 23, 2011 Subgenre: CRPG Publisher: Outspark Developer: Shanda Games |
 City of Heroes Freedom International Release: F2P Update – September 26, 2011 Subgenre: CRPG Publisher: NCSoft Developer: Paragon Studios |
 Digimon Masters Online International Release: Open Beta – September 27, 2011 Subgenre: CRPG Publisher: Joymax Developer: Joymax |
 Vindictus XE Europe Release: Open Beta – September 28, 2011 Subgenre: Action RPG Publisher: Nexon Developer: Nexon |
 GhostX: Ultimate International Release: Open Beta – September 28, 2011 Subgenre: Action RPG Publisher: GameKiss Developer: JCE |
 Dragon Nest North America Release: Live – September 28, 2011 Subgenre: Action RPG Publisher: Nexon Developer: Eyedentity Games |
 Brawl Busters International Release: Closed Beta 2 – September 29, 2011 Subgenre: Brawler Publisher: Rock Hippo Productions Developer: SkeinGlobe |