I noticed there has been Another 7DFPS. Last time I remember there were a few open source games in there, anyone know if this is the case this time too? http://7dfps.com
Well, SteamLUG entered the competition, but they used Valve's Source engine. Nevertheless, they said they'll probably release everything they make as open source, despite the proprietary engine. I don't know what came of the project.
You just wasted 3 seconds of your life reading this.
Missed this earlier, but Blendo did a couple of games based on id Tech 4 for 7DFPS. http://blendogames.com/news/?paged=2 License GPL 3, not sure if it covers only engine or also assets.