General
http://www.modplug.com/
http://www.united-trackers.org/
http://www.maz-sound.com/
Applications Anywhere:
http://sound.condorow.net/
Module Collections
http://www.modarchive.com/
Specific Software
http://mikmod.darkorb.net/
http://modplug-xmms.sourceforge.net/
http://www.soundtracker.org/
http://www.noisemmusic.org/it/
http://www.united-trackers.org/resources/software/screamtracker.html
http://www.sonicspot.com/octamed.html
http://home.earthlink.net/~mma
http://www.i.h.kyoto-u.ac.jp/~shom/timidity
http://datacreek.com/mp3/resources/enc-dec.html
http://linux.davecentral.com/3909_audedit.html
http://www.doclib.org/Linux/apps/sound/players/funktrackergold
http://reduz.com.ar/shaketr/
http://beast.gtk.org/
http://www.gnu.org/software/octal/octal.html
http://www.voyager.co.nz/~guyat/index.html
http://petra.hos.u-szeged.hu/~pilu/
Newsgroups
alt.binaries.sounds.mods
alt.music.mods