Java/JavaFX/Kotlin Game Library (Engine)
realistic driving simulation + functions for 2D/3D graphics
Vivid is a modern C++ 3D engine using OpenGL4+
Cross-platform 2D and 3D game engine
3D game engine for C and C++
Megalui: 2D/3D OpenGL & C/C++ Library for Scientific Visualizations
Game engine supporting many 3D/2D formats and graphic effects