OpenGL 3D GUI Engine and/or assets [closed]

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Are there any OpenGL 3D GUI libraries?

and/or

Are there any 3D assets like windows, list boxes, etc. that can be used in a 3D game engine?

Something like Age 3D is a great start, http://www.youtube.com/watch?v=Cq8Qs8lqqFA, but they aren't around anymore.

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Something like Crazy Eddie's GUI System?

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You might want to look at FLTK. Definitely still in development -- the most recent weekly snapshot was released today.

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Qt allows all GUI elements to drawn into an OpenGL viewport.

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You might want to check this: http://www.libnui.net/