...Written in C++, it is available under a liberal BSD license. There is a C API as well as bindings to various other languages, including C#, Python and D. Assimp loads all input model formats into one straightforward data structure for further processing.
Linderdaum Engine is an open source purely object-oriented 3D gaming engine written in C++. It is designed to be an integrated solution for the development of interactive 3D applications, for game, industrial and scientific visualization.
A powerful cross-platform and open-source 3-D rendering engine.
Panda3D is a powerful 3-D rendering engine for many Unix-based and Windows platforms. See the Panda3D home page at https://www.panda3d.org for more information and for forums and downloads. The source code is no longer hosted at SourceForge, but is now available from GitHub:
https://github.com/panda3d/panda3d