Is there someplace where I can get an open source version of Doom? I have my original Macintosh versions of 1 and 2 but they're packed away in storage and I really don't want to go digging through loads of junk to get my originals to use with the free game engine that's available. Are there any stand-alone scenarios?

I played the Atari Jaguar version first, and I loved it. Now I have a hard time playing it, with how low rez it is. When I bought my first Mac, I also bought a copy of Marathon 2: Durandal. That one ruined me for pixelated console versions of Doom - Marathon 2 looked fantastic for its time. Once Bungie started developing Halo, they made the Marathon games open source. You can download modern versions of it with updated textures for all sorts of systems. I always hoped that the original Doom would be released that way.