Today I have a real "underground & secret" game: no website, no description, no nothing really... just a forum post and some cool game-play videos:
It seems to be called "Brood Hunter" and is quite obviously a Gloom inspired Quake1 mod.
However given that it most likely used the GPL Darkplaces Engine (same as Xonotic) and since game-play looks great, I have to do some wishful thinking here and hope it will be released as an open-source game so that we can work on replacing the remaining non-free Quake1 content at some point :)
Oh and I also stumbled upon an open-source Daikatana remake, using a heavily modified Quake1 engine. YES, that Daikatana!
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