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Quake II Remaster Source Code Released
(www.neowin.net)
If it's free and open source and it's also software, it can be discussed here. Subcommunity of Technology.
This community's icon was made by Aaron Schneider, under the CC-BY-NC-SA 4.0 license.
I don't know if the whole game is worth playing but the intro alone was pretty groundbreaking for its time. Or well, one can just watch on youtube I suppose: https://www.youtube.com/watch?v=aJoOViakt3I
Absolutely blew me away back when it came out.