Blender.org has announced Apricot, an open source 3D game.
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[...] a pre-sale campaign to purchase the DVD set in advance will be organized to allow the Blender and Crystal Space communities to support this project. Again theres the ambitious target of reaching a 1000 DVDs sold in advance, before february 1st. Expect on the DVD the complete game, all content in Creative Commons Attribute, video blog material, and clear examples and/or tutorials for how to extend the game, add levels, change characters, and so on. Early purchasers of the Apricot game will get their names credited on the game intro and final credit roll.
Please support open source!