Linux -K-

KNOPPIX (Internasional)
KNOPPIX is a bootable Live system on CD or DVD, consisting of a representative collection of GNU/Linux software, automatic hardware detection, and support for many graphics cards, sound cards, SCSI and USB devices and other peripherals. KNOPPIX can be used as a productive Linux system for the desktop, educational CD, rescue system, or adapted and used as a platform for commercial software product demos. It is not necessary to install anything on a hard disk. Due to on-the-fly decompression, the CD can have up to 2 GB of executable software installed on it (over 8GB on the DVD "Maxi" edition).

K12Linux - Linux Terminal Server (Internasional)
K12LTSP is based on CentOS Linux and the Linux Terminal Server Project. It's easy to install and configure. It's distributed under the GNU General Public License. That means it's free and it's based on Open Source software.

Kubuntu (Internasional)
Kubuntu is a user friendly operating system based on KDE, the K Desktop Environment. With a predictable 6 month release cycle and part of the Ubuntu project, Kubuntu is the GNU/Linux distribution for everyone.