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.nl.debian.org
Java Desktop System
Java Desktop System
http://wwws.sun.com/software/javadesktopsystem/details.html
Knoppix
Knoppix
http://www.knoppix.org/
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
Slackware
Slackware
http://www.slackware.com/
Small Linux
Small Linux
http://www.superant.com/smalllinux/
The Lwn.net Lijst
The Lwn.net Lijst
http://lwn.net/Distributions/
Tiny Linux
Tiny Linux
http://tiny.seul.org/en/