http://www.wolfire.com/humble
Video on the site explains it all.
Oh, and I personally vouch for Gish and Penumbra.
I'm going to let this slide, although promoting a special offer on another site isn't really allowed here normally, nor is it really what the Merchant Corner was for...
Yah. My fault. He started in the Castle Keep, but failed to provide enough information to identify what he was linking to.
Sokay. I'm just gonna lock it for now, so that we don't have too much discussion on this.