Humble Weekly sale, with games so ace you may just fall in love with them, from Atlus Games, Ace Team and Tripwire Interactive. Games for any price you wish are Zeno Clash, Zeno Clash 2, Killing Floor and Dwarfs!?. Pay $6 or more and you'll net Rock of Ages and Rising Storm. All games come with Steam keys and every one except for Dwarfs!? includes its soundtrack.
Whatever you decide to pay, it can be split among the developers, Humble Bundle and two charities: Child's Play and the American Red Cross.