Image based Augmented Reality frame works

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http://stackoverflow.com – I am evaluating frameworks for my Augmented Reality Image based for mobile. I came up with following Augment Reality frameworks. http://www.artoolworks.com/ [Vuforia]:https://developer.qualcomm.com/mobile-development/mobile-technologies/augmented-reality, It uses [Unity]:http://unity3d.com/unity/ Is there any other good frame works, Which is the best frame work for Image based Augment Reality? (HowTos)