Khronos Vulkan, OpenGL, and OpenGL ES Conformance Tests
Desktop/Android/HTML5/iOS Java game development framework
DirectX 8 to OpenGL wrapper for legacy apps and portability
Yocto/GL: Tiny C++ Libraries for Data-Driven Physically-based Graphics
Interactive, thoroughly customizable maps
Karel - 3D language interpreter
A cross-platform OpenGL based lightweight scenegraph library
makefile scripts and templates for Allegro 4 game library
Zen3D is a 3D engine and editor for creating games