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Tombstone Engine - A direct successor to the C4 engine.
Xonotic - Xonotic is a free (GPL), fast-paced first-person shooter that works on Windows, OS X and Linux.
Babylon.js - A complete JavaScript framework for building 3D games with HTML5, WebGL and Web Audio
Counter-Strike - Counter-Strike is a PC-exclusive FPS video game developed by Valve Corporation.
PlayCanvas - PlayCanvas is an open-source game engine built on WebGL and WebVR.
Quake - Quake is a series of first-person shooter video games released by id Software.