Open Inventor® by VSG

Open Inventor® is an object-oriented, cross-platform 3D graphics toolkit for the development of industrial-strength, interactive applications using C++, .NET or Java.
Based on OpenGL®, and providing the same power and functionality at an object-oriented level, its easy-to-use API, its extensible architecture, and its large set of advanced components provide developers with a high-level platform for rapid prototyping and development of 3D graphics applications.

Applications powered by Open Inventor will also benefit from powerful extensions such as VolumeViz for large volume data sets, MeshViz XLM for large mesh data sets, ScaleViz for multi-GPU, multi-workstation and immersive VR, …