In February 2012, Aion will be switching from a subscription based system to the free-to-play model. This switch spares your wallet from the start: there are no monthly charges or costs for registration and the game client. The whole world of Atreia and all its regions is open for your exploration: all the quests, all playable classes, all specialisations and all instances are available. For new players there are only a few limitations, that concern trading and chat amongst others. You can always upgrade your account and enjoy Aion in its full extent: with a Gold Pack you unlock full functionality.
UPDATE: Super Hero Squad Online is Live for Europe too since 29 November 2011.
Get ready to Hero Up! Super Hero Squad Online is the first Marvel MMO and now you can play as your favorite Marvel Hero, Super Hero Squad style! Te wildly popular cartoon and toy line is an online game where you and your friends can battle villains on the streets of VillainVille, go head-to-head in an epic card battle, decorate your helicarrier or just hang out and chat.
Army Rage is an MMOFPS game based on World War II.
Neverwinter is an MMORPG based on the acclaimed Dungeons & Dragons fantasy roleplaying game. It should be free to play.