Limbo - “Dark, disturbing, yet eerily beautiful, Limbo is a world that deserves to be explored.” Joystiq. “Limbo is as close to perfect at what it does as a game can get.” Destructoid. Buy LIMBO: Special Edition.
Virtual Audio Cable - Ever wanted to record your speaker output? (loopback) This is for you.
A Walk in the Dark - A Walk in the Dark is one of the most addictive and quite challenging Action, Puzzle-Platform and Adventure video game that takes you on an amazing journey in the world of wonders.
JACK Audio Connection Kit - JACK Audio Connection Kit|Home
World of Goo - get it here | read the blog | forum.
Loopback by RogueAmoeba - Get all the power of a high-end studio mixing board, right inside your Mac!