Fedora - "The Fedora Project is an open source project sponsored by Red Hat and supported by the Fedora community."
Free version availalbe
Mandrake - "Mandrakelinux is a friendly Linux Operating System which specializes in ease-of-use for both servers and the home/office."
Free version availalbe
Suse - "Novell Linux Desktop 9 is a desktop operating system and office-productivity environment that enables businesses to use Linux and open source with confidence."
Free version availalbe
Ubuntu - "Linux-based operating system, freely available with both community and professional support."
Free version availalbe
Xandros - "Xandros Desktop OS is an intuitive graphical environment that works right out of the box and offers unrivaled compatibility with Microsoft Windows."
Free version availalbe