Java/JavaFX/Kotlin Game Library (Engine)
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Vivid is a modern C++ 3D engine using OpenGL4+
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Cross-platform 2D and 3D game engine
Vivid Engine 2 is an open source 3D Engine coded using C# and C++.
XNA based game engine completely written in c#
3D game engine for C and C++
Game engine supporting many 3D/2D formats and graphic effects