Zauberer is a libre, modified BSD-licensed content replacement for the GPL Hexen engine and is in early stages at the moment. The goal is to have a complete FPS/RPG game compatible with available Hexen mods. There is currently an Egyptian theme proposed. Those interested in checking out the current resource file in WAD format are welcome to Zauberer's GitHub at https://github.com/CireG/Zauberer
There is a discussion thread at Doomworld here: http://www.doomworld.com/vb/freedoom/72519-zauberer/
Feel free to ask anything about the project here!