OGRE is described as '(Object-Oriented Graphics Rendering Engine) is a scene-oriented, flexible 3D engine written in C++ designed to make it easier and more intuitive for developers to produce applications utilizing hardware-accelerated 3D graphics' and is a game development tool in the development category. There are more than 10 alternatives to OGRE for a variety of platforms, including Windows, Linux, Mac, BSD and iPad apps. The best OGRE alternative is Torque 3D, which is both free and Open Source. Other great apps like OGRE are HARFANG 3D, Pygame, Zmodeler and Grit Game Engine.