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Flax Engine, multi-platform 3D game engine
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Stride (formerly Xenko), a free and open-source cross-platform C# game
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The ioquake3 community effort to continue supporting/developing id's
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Descent 3 by Outrage Entertainment
A game framework written with osu! in mind.
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KorGE Game Engine. Multiplatform Kotlin Game Engine & Korlibs
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The Open Toolkit library is a fast, low-level C# wrapper for OpenGL
scene-oriented, flexible 3D engine (C++, Python, C#, Java)