The Humble Indie Bundles or Humble Bundles are a series of game bundling experiments that allow users to purchase collections of multi-platform DRM-free independently developed video games online in a "Pay what you want" manner, with proceeds bypassing middlemen and going directly to the indie developers and charities.
Humble Introversion Bundle customers now have access to the source code for _Darwinia_, _Multiwinia_, _DEFCON_, and _Uplink_! Once you've purchased the bundle, check your download page for a source snapshot and gain access to Introversion's developer forums, wiki, and SVN repository.
The official website: Humblebundle.com