OGRE – Marvelous free and open-source 3D graphics rendering engine

OGRE (short for Object-Oriented Graphics Rendering Engine) is a free, open-source, and cross-platform 3D graphics real-time rendering engine that is widely used in 3D simulation and game development fields, written in C++ in 2001. Because it is an open-source graphics engine, like Linux, it has been adapted and expanded by a variety of different groups and organizations, so that it can adapt to different application areas and has more powerful functions.