panda3d - Powerful, mature open-source cross-platform game engine for Python and C++, developed by Disney and CMU

Panda3D is a game engine, a framework for 3D rendering and game development for Python and C++ program. It featues include Exposes Full Power of Graphics API, Powerful interface between shaders and engine, Support for tessellation and compute shaders, Fullscreen filters such as Bloom, Cartoon Inking, Volumetric Lightning, Blur/Sharpen and Ambient Occlusion, as well as the ability to use your own, Get models from your 3d modeller to Panda3D easily, Several options for adding sounds, physics simulation to your game.