crossplatform multithreaded object-oriented render and audio engine
A simple 3D framework in C++
Vivid is a modern C++ 3D engine using OpenGL4+
Vivid Engine 2 is an open source 3D Engine coded using C# and C++.
3D game engine for C and C++
Pear3DEngine is a modern and modular 3D development framework
Minimalist 3D Scenegraph Management Framework