The Humble Indie Bundle is a compilation of six independent games available to be purchased on-line for a limited time, where the customers choose the value they want to pay and part of the money goes to charity. The developers behind some of the included titles promised that, after reaching one million dollars in sales, they would open the code for Lugaru HD, Gish and Penumbra Overture. This remarkable amount was reached in one week, and as result the code for Lugaru and Penumbra are already available, with the two other games to follow shortly and the surprise announcement that Aquaria is going open-source as well. The promotion received an extension of four more days.

Update: All the code for the promised games is now open source!