Twin directories of doom:

[DIR]  ftp://ftp.uni-leipzig.de/pub/linux/pub/comp/os/linux/sunsite/games/x11/action/doom/
[DIR]  ftp://ftp.uni-leipzig.de/pub/linux/pub/comp/os/linux/sunsite/games/doom/
[DIR]  ftp://ftp.reed.edu/mirrors/faqs/games/doom/
[DIR]  ftp://ftp.eutelia.it/pub/Sunsite_Mirror/games/doom/
[DIR]  ftp://ftp.internat.freebsd.org/pub/FreeBSD/ports/games/doom/
[DIR]  ftp://ftp.farlep.net/pub/Linux/games/doom/
[DIR]  ftp://ftp.farlep.net/pub/Windows/games/doom/
[DIR]  ftp://ftp.farlep.net/pub/linux/games/doom/
[DIR]  ftp://ftp.uni-hannover.de/pub/mirror/os2/games/action/doom/
[DIR]  ftp://ftp.uni-hannover.de/pub/mirror/bsd/FreeBSD/development/FreeBSD-CVS/ports/games/doom/
[DIR]  ftp://ftp.amigascne.org/old/groups/d/doom/
[DIR]  ftp://ftp.swin.edu.au/freebsd/development/FreeBSD-CVS/ports/games/doom/
[DIR]  ftp://ftp.cyf-kr.edu.pl/pub/mirror/usenet/news.answers/games/doom/
[DIR]  ftp://ftp.cyf-kr.edu.pl/pub/mirror/usenet/rec.answers/games/doom/
[DIR]  ftp://ftp.mao.kiev.ua/pub/software/Linux/games/doom/
[DIR]  ftp://ftp.mao.kiev.ua/pub/software/unix/X11/games/doom/
[DIR]  ftp://ftp.actrix.gen.nz/.vol1/games/doom/
[DIR]  ftp://ftp.linux.org.uk/pub/linux/arm/Old/distrib/non-chargeable/doom/
[DIR]  ftp://ftp.johngaughan.net/pub/doom/
[DIR]  ftp://ftp.sk.freebsd.org/pub/FreeBSD/development/FreeBSD-CVS/ports/games/doom/
[DIR]  ftp://ftp.powerstationbbs.ca/pub/backbone/doom/
[DIR]  ftp://ftp.free.fr/.mirrors1/ftp.freebsd.org/development/FreeBSD-CVS/ports/games/doom/
[DIR]  ftp://ftp.dc.aleron.net/pub/FreeBSD/development/FreeBSD-CVS/ports/games/doom/
[DIR]  ftp://ftp.cse.buffalo.edu/mirror/BSD/FreeBSD/development/FreeBSD-CVS/ports/games/doom/
[DIR]  ftp://ftp13.freebsd.org/pub/FreeBSD/development/FreeBSD-CVS/ports/games/doom/
[DIR]  ftp://ftp13.freebsd.org/cvsup/ncvs/ports/games/doom/
[DIR]  ftp://ftp13.freebsd.org/cvsup/ncvs/CVSROOT-ports/games/doom/
[DIR]  ftp://128.237.157.9/scene.org/parties/1996/flag96/wild/doom/
[DIR]  ftp://128.237.157.9/scene.org/mirrors/hornet/code/effects/doom/
[DIR]  ftp://128.237.157.9/pub/scene.org/parties/1996/flag96/wild/doom/
[DIR]  ftp://ftp.linuxforum.hu/Games/doom/
[DIR]  ftp://ftp.gathering.org/scene.org/parties/1996/flag96/wild/doom/
[DIR]  ftp://ftp.isy.liu.se/pub/colour/doom/
[DIR]  ftp://ftp2.tw.freebsd.org/FreeBSD/development/FreeBSD-CVS/ports/games/doom/
[DIR]  ftp://ftp.nz.freebsd.org/pub/FreeBSD/development/FreeBSD-CVS/ports/games/doom/
[DIR]  ftp://ftp.vabo.cz/pub/linux/games/doom/
[DIR]  ftp://ftp.euro.net/pub/mirrors/FreeBSD/development/FreeBSD-CVS/ports/games/doom/
[DIR]  ftp://alge.anart.no/pub/games/3D/doom/
[DIR]  ftp://64.50.238.52/.1/netwinder/users/g/guinan/doom/
[DIR]  ftp://64.50.236.52/.1/netwinder/users/g/guinan/doom/
[DIR]  ftp://ftp.int.ru/.1/FreeBSD/development/FreeBSD-CVS/ports/games/doom/
[DIR]  ftp://ftp.kr.freebsd.org/pub/FreeBSD/development/FreeBSD-CVS/ports/games/doom/
[DIR]  ftp://ftp.demon.nl/disk3/Demon/mac/games/doom/
[DIR]  ftp://ftp.demon.nl/disk2/idsoftware/idstuff/doom/
[DIR]  ftp://ftp.demon.nl/disk2/freebsd/development/FreeBSD-CVS/ports/games/doom/
[DIR]  ftp://ftp.nstu.ru/pub/vendors/Sun/games/doom/
[DIR]  ftp://ftp.swb.de/pub/docs/news.answers/games/doom/
[DIR]  ftp://ftp.uniovi.es/pub/linux/games/doom/
[DIR]  ftp://ftp2.sk.freebsd.org/FreeBSD/development/FreeBSD-CVS/ports/games/doom/
[DIR]  ftp://ftp.padua.org/pub/msdos/mirrors/ftp.idsoftware.com/doom/