Panda3D is a game engine, a framework for 3D rendering and game development for Python and C++ programs.
Panda3D is Open Source and free for any purpose, including commercial ventures, thanks to its liberal license
Go ahead and grab it here
To learn more about Panda3D's capabilities, visit the gallery
and the feature list
To learn how to use Panda3D, check the documentation
If you get stuck, ask for help from our community
, which is very active.