Eve Online
No MMO can claim to be as player-driven as Eve Online, with the space game boasting mega-corporations run by legions of players and, very occasionally, gigantic space battles with upwards of 5,000 participating pilots.
Eve Online’s free-to-play model lets players experience all that space madness (bar access to some end-game ships and skills) without paying a subscription fee. Its steep learning curve can be pretty daunting, so we highly recommend reading our Eve Online beginner’s guide if you’re just getting started.