Ubuntu is an open source software platform that runs everywhere from the smartphone, the tablet and the PC to the server and the cloud.
UpUbuntu is an Ubuntu blog that provides users with tips, tutorials, how-to guides, and much more.
vBulletin 4.0 Publishing Suite with CMS
A help and support forum for Ubuntu Linux.
Ubuntu Handbook -- News, Tutorials, Howtos for Ubuntu Linux
Xubuntu – Xubuntu is an elegant and easy-to-use operating system.