- [DarkPlaces](http://icculus.org/twilight/darkplaces/)
- [Nexuiz](http://www.alientrap.com/games/nexuiz/)
- [Osirion](http://osirion.org/)
+- Quake
- [Quetoo](http://quetoo.org/)
- [Unvanquished](https://www.unvanquished.net/)
- [Warsow](http://www.warsow.net/)