Just like they did with some earlier games, Wolfire Games have now open sourced the game code for Overgrowth. What is it? Overgrowth is a 3D martial arts action-adventure featuring giant rabbits — jump, kick, throw, and slash your way to victory.
You will still need to own a copy of the game, as the open source release does not include the data files, which is a great way for developers to support the open source community (and enable their game to live on forever pretty much) while also continue to earn from it easily.
The source code is available on GitHub.