+- [Nexuiz](http://www.alientrap.com/games/nexuiz/)
+- [OpenArena](http://www.openarena.ws)
+- [Osirion](http://osirion.org/)
+- Quake _— NetRadiant writes Q3 map that can be compiled to Q1 bsp using `hmapc`_
+- [Quetoo](http://quetoo.org/)
+- [Unvanquished](https://www.unvanquished.net/)