Coin3D

Coin is a 3D graphics library with a C++ Application Programming
Interface based on the Open Inventor 2.1 API.  Open Inventor, for those
who are not familiar with it, is an OpenGL-based, retain-mode, 3D model
scene-graph rendering and interaction library, which has become the de
facto standard graphics library for 3D visualization and visual
simulation software in the scientific and engineering community.

New versions are published under the BSD 3-clause license.

WWW: https://bitbucket.org/Coin3D/coin/wiki/Home