Where can I download full version PC games for free?
[Ed. note: Stay with LEGAL sources everyone! Answers referring to illegal sources will be deleted.]
There's a lot of games on Steam for free, I did an article a while back: //www.makeuseof.com/tag/selection-freetoplay-steam-games/
It's mostly going to be free to play stuff though, like League of Legends and other MMOs like World of Warcraft which is free up to a certain level (20? 40?) though after you've put the time into getting there, you'll have to pay to continue...
If you have an Xbox 360, don't forget there's these too: //www.makeuseof.com/tag/even-more-free-games-downloads-for-your-xbox-360/
Origin, EA's game client, has "on-the-house" games from time to time. Completely free, but requires using their client. Plants vs. Zombies is the current game.
Otherwise, Justin has you covered with this list. It contains everything I was going to say in response to you.
Link didn't work. Here's the link to Justin's article: