Debian 5. Linux distribution designed and recommended to power users. One of the most oldest and biggest distributions. 
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Fedora, formerly known as Fedora Core, is a Red Hat sponsored and community supported open source project. 
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Gentoo is an operating system based on either Linux or FreeBSD that can be automatically optimized and customized for just about any application or need. Extreme configurability, performance and a top-notch user and developer community. 
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KNOPPIX is a bootable Live system on CD, 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. 
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Kubuntu is an official derivative of Ubuntu using the KDE environment instead of GNOME. It is part of the Ubuntu project and uses the same underlying system. It is an exciting distribution that showcases the full potential of the KDE desktop. 
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Mandriva formerly known as Mandrake Linux, is an RPM-based distro that was originally designed to be binary compatible with Red Hat Linux. 
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Linux Mint 7, codename "Gloria". One of the most user-friendly distributions. Based on Ubuntu Linux. 
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The openSUSE project is a community program sponsored by Novell. 
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PCLinuxOS 2007 is distributed as a LiveCD, which can also be installed to a local hard disk drive. 
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Slackware 12.2. Slackware Linux is the world's oldest surviving Linux distribution. 
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Slax is fast and beautiful Linux operating system. It runs directly from the CD without installing. The Live CD described here is based on the Slackware Linux. 
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Ubuntu is an open source Linux-based operating system that starts with the breadth of Debian and adds regular releases, a clear focus on the user and usability and a commitment to security updates with 18 months of support for every release. 
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Xubuntu is an official derivative of Ubuntu using the Xfce desktop environment. It is intended for users with less-powerful computers, or those that require a highly efficient desktop environment on faster systems. Xubuntu features primarily GNOME applica 
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