About Ubuntu:

Ubuntu is a computer operating system based on the Debian Linux distribution.

About Fedora:

The Fedora Project is an openly-developed project designed by Red Hat, open for general participation, led by a meritocracy, following a set of project objectives.

About Linux Mint:

Linux Mint is an operating system for personal computers, based on (and compatible with) Ubuntu, with integrated media codecs.

About Sabayon:
Sabayon Linux is a live DVD designed to transform a computer into a powerful Gentoo Linux system.