websites with free steam game keys

Indiegala does giveaways from time to time.

I could be wrong since I don't really use any but I think playblink and gameminer have something of the sort?

I think he means like ... earning them ... not giveaways where you get lucky and just so happen to get a game.

for giveaways of free games i can recommend http://www.indiekings.com/ but for earning them the only site i know is tremor too