Vivid is a modern C++ 3D engine using OpenGL4+
A real time 3D graphics engine written in C++
Vivid Engine 2 is an open source 3D Engine coded using C# and C++.
PHIGS (Programmer's Hierarchical Interactive Graphics System)
Webgl Engine
A cross-platform game framework based on OpenGL and GObject.
Pear3DEngine is a modern and modular 3D development framework
Minimalist 3D Scenegraph Management Framework
Multi-Language Wrapper Collection for the Irrlicht Engine
This project has moved to http://www.volumesoffun.com