crossplatform multithreaded object-oriented render and audio engine
Java/JavaFX/Kotlin Game Library (Engine)
Real-time physically based rendering engine for Android, iOS, and more
realistic driving simulation + functions for 2D/3D graphics
Vivid is a modern C++ 3D engine using OpenGL4+
Vivid Engine 2 is an open source 3D Engine coded using C# and C++.
Cross-platform 2D and 3D game engine
.NET wrapper for the Irrlicht Engine
XNA based game engine completely written in c#
Gimpel3D - 2D/3D Stereo Conversion Editor
Game engine supporting many 3D/2D formats and graphic effects
A 3D rendering / entity engine