So Square Enix has launched a new (I think cloud-based) gaming service that allows you to play their older games for free! Yes, it really is free, you just have to watch ads. But anyways, you just have to sign up at CoreOnline.com and you are set.
Square Enix Announces CoreOnline | GameFans
Right now they are on beta, so the game selection isn't awesome. This should be getting better soon, though! You just need a browser; no downloading or anything. I know I am definitely going to be using this, are you?