QuArK (aka Quake Army Knife), is a free and open-source program for developing 3D assets for a large variety of video games, mostly first-person shooters using engines similar to or based on the Quake engine by id Software. QuArK runs on Microsoft Windows. Overview QuArK is released under the GNU General Public License and has the ability to edit maps (either directly or through an intermediate compiler process), and can import, export, manipulate and convert models, sounds, textures and various other game assets, or create any of these assets from scratch. It is also possible to move or change dynamic game objects without the need to recompile the whole map which makes the fine-tuning of details quicker. QuArK uses external compilers (like Q3Map2) to produce the actual level-file used by the game. These compilers can be fully configured using their command-line parameters, and once done, QuArK remembers these settings so they can be used every time. The interface is based upon VCL and includes a multitude of flyover hints and other forms of in-program documentation. It also offers multiple editor layouts, including 2D wireframe and 3D textured views, where it is possible to see how the map or model will look in-game. This view can be rendered with a built-in software, Glide, OpenGL or Direct3D renderer. Views have three modes: wireframe, solid color and textured, and supports transparency and lighting in OpenGL mode. QuArK is a brush-based editor, that works by adding brushes into an empty space, building the map block-by-block. To assist, more advanced features are available, including constructive solid geometry functions such as brush-subtraction. Additionally, for engines that support it, Bézier surfaces can be used to create curved surfaces. QuArK also has a built-in leak finder in order to prevent holes in the map. Items can be added to a map simply by selecting them from a list of available entities, and their properties can be edited once they are placed in the map. Along with support for most games based on engines developed by id Software, QuArK also has support for other game engines such as Source, Genesis3D, 6DX, Crystal Space, Torque, and Sylphis 3D. It is possible to add plug-ins, written in Python, to extend the capabilities of the editor, or to make changes to the official Python files to alter the way QuArK's functions work. More information about this can be found in the QuArK