GNU/Linux: Gnu.org | Kernel

Debian:
Debian.org | Download
Trova .deb | Status .deb | Installer
DebianPlanet.org | Planet.debian
Backports.org | dir | blackdown.org
Cd-debian-Woody_Cs.unibo.it

Distribuzioni: Ubuntu | DeMuDi

Suse | OpenSuse
RedHat | Fedora | Mandriva

FreeBSD | OpenBSD | NetBSD
Gnu/LINUX

Manual e Howto's:

Tldp.org | Pluto.it
Help4Linux

Manuali Debian:
Debian Manuals
Debian ReferenceGuide

Site Linux Oriented:
Ziobudda.net
Live-CD: Knoppix | knoppix.net
KnopILS [ftp download]

Gnoppix

LUG:
Erlug.it