Urho3D
Open SourceUrho3D is a free, cross-platform 2D/3D game engine written in C++ and released under the MIT license. It is known for its lightweight design and efficiency, making it a suitable choice for various game development projects.
Key Features
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High performance due to C++ core.
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Completely free with MIT license, no royalties.
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Cross-platform support for multiple operating systems and devices.