Debian
Debian gnu/linux is a free distribution of the gnu/linux operating system. it is maintained and updated through the work of many users who volunteer their time and effort.
http://www.debian.com
Linux Land
Linuxland, de nederlandse linux site. met oa een shop waarin u uw linux producten kunt kopen, een linuxclub voor 10% korting op alle artikelen in de shop, een forum waarin u kunt discusieren over linux gerelateerde zaken, en nog veel meer
http://www.linuxland.nl
Redhat
Red hat is the world's leading open source technology solutions provider with offerings including red hat enterprise linux, open source applications, security and systems management, virtualization, services oriented architecture (soa) solutions, server and desktop operating systems, java application software and services, and the jboss enterprise middleware suite.
http://www.redhat.com
Suse
Suse
http://www.suse.com