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 * [Bullet](http://bulletphysics.org/wordpress/) - Real-time physics simulation.
 * [bgfx](https://github.com/bkaradzic/bgfx) - Cross-platform, graphics API agnostic, "Bring Your Own Engine/Framework" style rendering library.
 * [Cinder](https://libcinder.org/) - Cinder is a community-developed, free and open source library for professional-quality creative coding in C++.
+* [CRYENGINE](https://github.com/CRYTEK-CRYENGINE/CRYENGINE) - A pay what you want next gen 3D game engine written in C++.
 * [Dash](https://github.com/Circular-Studios/Dash) - A free and open 3D game engine written in D.
 * [gameplay](http://gameplay3d.io/) - A free, open-source, cross-platform, 2D + 3D game framework written in C++. It is aimed towards indie game developers who are creating desktop and mobile games.
 * [Godot](http://www.godotengine.org/) - Open source game engine with rich API.