A simple 3D framework in C++
Vivid Engine 2 is an open source 3D Engine coded using C# and C++.
.NET wrapper for the Irrlicht Engine
simple 3d scene viewer for windows/linux/android
Pear3DEngine is a modern and modular 3D development framework
Minimalist 3D Scenegraph Management Framework
A Lightweighted Toolkit For Volume Rendering
PixelLight is a cross-platform application framework
In-flight navigation (and more) for private pilots (Linux).