The Blender Game Engine is a component of Blender, a free and open-source comprehensive 3D production suite, used for making real-time interactive content. The game engine was written from scratch in C++ as a mostly independent component, and includes support for features such as Python scripting and OpenAL 3D sound.
Powerful, and easy to use game engine, but looks like the developers are lazy to upgrading the graphics i think ,and the user who using this engine must upgrading the graphics byself .