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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.
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I never quite liked it as much as 1 or even 3, but it was genre defining back when it was new. People give a lot of praise for what Half-Life did for FPS, but Quake 2 did a lot of what Half-Life made popular, before Half-Life (by a year). It was also the first game, IIRC, to introduce reloading as a mechanic.