Qfusion  Qfusion is a 3D game engine. The project was started by Victor Luchitz along with several others. It is written in C for use on Windows and Unix-based systems. The engine also supports the data of "Quake III" as maps, 3D models and shaders. Qfusion is a fork of id Tech 2, popularly known as the Quake II engine. Qfusion is free and open-source software subject to the terms of the GNU General Public License (GPL). The engine supports Ogg Vorbis sound and KTX (ETC1), TGA, JPEG, PNG for images. More recent versions of Qfusion engine also extend the Q3 rendering scheme to include Normal Mapping, GLSL shaders (including bump mapping and cel shading), and skeletal animation. The engine is used by following games: