What PrBoom is to Doom, Open Arena is to Quake 3 Arena. Quake 3 Arena is another innovator of the FPS genre. It helped launch a hugely competitive multiplayer environment as well as a race for a better graphics card to churn out more frames per second. The Quake 3 engine has been used for a staggering number of games. Since id Software open sourced the engine, it is capable of running on the Raspberry Pi. Open Arena is a project to develop a completely free version of Quake 3 Arena. Using entirely new sprites, 3D models, textures, and levels, anyone can download Open Arena to their computer and play for free.