csDoom Out
There's another Doom source modification out, client/server Doom, which allows you to join Doom servers on the fly like the current 3D games. So if you're feeling a bit nostalgic, give this a try. There should be a Linux port soon too, according to the author. Thanks prower.
From The Chatty
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Sweet...now all they need to do is to tweak it.
Oh yeah, and #1, you suck.