I bought a Humble Bundle today and got a couple keys for games I have zero interest in. I also found a couple old keys that I never redeemed and I already own the game. Might as well join the giveaway game.
Cities XL Platinum
Cities XXL
Farming Simulator 2013 Platinum Edition
Costume Quest
Shadowrun Returns
I also have a key for The Sims 3
and a few expansion things for it (Late Night, Date Night, High End Loft Stuff), but those are on EA's Origin platform. If you're willing to deal with that garbage then you're welcome to the keys.