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Godot Engine - Free and open source 2D and 3D game engine

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Castle Game Engine on X: Convert to X3D (from glTF, OBJ, STL, Collada, …) and change X3D encodings using online Castle Game Engine converter / X

IM4 AR within the Unity Game Engine Online Workshop

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Design Your First 3D Video Game With the Atmosphir Game Engine! (Ages 12 To 18) | Small Online Class for Ages 12-17

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