Gentoo Linux is a versatile and fast Linux distribution for x86, PowerPC, Sparc, and Sparc64 that's geared towards Linux power users. Unlike other distros, it has an advanced package management system called Portage. Portage is a true ports system in the tradition of BSD ports, but is Python-based and sports a number of advanced features including dependencies, fine-grained package management, "fake" (OpenBSD-style) installs, path sandboxing, safe unmerging, system profiles, virtual packages, config file management, and more.
Mandriva is an RPM-based Linux distribtion. It excels at usability and simplicity, features thoroughly preconfigured KDE and GNOME desktops, and includes cool tools like supermount (transparent access to removable media) and DiskDrake (a full-featured graphical hard-drive partitioner). Unlike former versions, Mandriva is not a tuned-up Red Hat, but a very mature Linux distribution on its own. Mandriva is published by a company, but is a completely open and transparent free-software project.
Devil-Linux is a special secure Linux distribution which is used for firewalls, routers, gateways, and servers. The goal of Devil-Linux is to have a small, customizable, and secure Linux system. Configuration is saved on a floppy disk or USB stick, and it has several optional packages. Devil-Linux boots from CD, but can be stored on CF cards or USB sticks.
Cool Linux CD is a bootable CD that contains a a live Linux distribution based on RedHat 7.3. It also includes the XFS filesystem, devfs, IceWM, QVWM, ROX-filer, OpenOffice.org, Opera, Mozilla, Sylpheed, Pan, Licq, X-chat, GFTP, ppp-redialer, xmms, xine, mplayer, gqview, LinNeighborhood, IPTraffic, VMWare, and more.
SoL-diag is a diskless Linux distribution that was designed for the rescue and analysis of i686 computers. The 36MB image contains over 300 programs, including DVD and MP3 players and CD-RW buring tools. It is also useful for improving your Linux skills and benchmarking computers without having to install programs to the hard drive.