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.
Blender is a free open source tool , with powerful functions with easy logic bricks and python commands , maybe it has bad graphics processing by default , but using shaders and screen filters do job