Here are the instructions to obtain the source code and resources for Angry Ninjas.
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git clone git://github.com/totallyevil/cocos2d-xna.git or git clone git://github.com/mono/cocos2d-xna.git
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git clone git://github.com/mono/MonoGame.git
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git clone git://github.com/xamarin/AngryNinjas
There should be three directories
AngryNinjas MonoGame cocos2d-xna
Open the solution from AngryNinjas for the platform you want to target.