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qfusion is the id Tech 2 derived game engine

Features (incomplete list)

  • Fully open-source under the GPLv2 and easy to mod
  • Runs on Linux, macOS, Windows and Android (in development)
  • Modern and fast OpenGL 3.0 and OpenGL ES 3.0 renderer, running in a dedicated program thread
  • Realtime lighting and shadows via omnidirectional and cascaded shadow maps
  • Scriptable User Interface based on XHTML/CSS standards with support for remote content and scalable vector graphics
  • Support for vertex and skeletal animation
  • HDR & Bloom support with configurable color correction profiles
  • Fullscreen Anti-Aliasing support in the form of MSAA or FXAA
  • Powerful multiplayer & eSports features (global stats, friend lists, IRC, TV-server, etc.)
  • Ready to go FPS example gametype scripts from Warsow
  • Multithreaded sound mixer design
  • OpenAL support
  • Hardware-accelerated Ogg Theora video playback


  • C/C++ mods (plugins) can ship new gameplay features while maintaining compatibility with the core
  • UI and game mechanics scriptable with AngelScript (C++ style syntax)
  • Flexible HUD scripting
  • "Pure" (models, maps, textures, sounds) game content is automatically delivered to players by game servers
  • Players are allowed to locally override non-"pure" game content

Notable games

License (GPLv2)

This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version.

This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

See the GNU General Public License for more details.

You should have received a copy of the GNU General Public License along with this program; if not, write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.