Tin Hat is a Linux distribution derived from hardened Gentoo. It aims to provide a very secure, stable, and fast desktop environment that lives purely in RAM. Tin Hat boots from CD, or optionally USB pen drive, but it is not a LiveCD in that it does not mount any file system from the boot device. Rather, Tin Hat employs a massive squashfs image which expands into tmpfs upon booting. This makes for long boot times, but remarkable speeds during human-computer interaction.
Myrinix is a multi-purpose portable Linux distribution based on Debian Sid. It can be installed on a live CD, USB drive, or even a Windows XP NTFS partition without modifying the MBR. Myrinix also supplies a series of application modules that can be easily added to a live CD or portable drive for more functionality.
GNUSTEP Live CD contains a lot of software for GNUstep, a free implementation of the OPENSTEP framework (which is also directly used in Mac OS X as Cocoa). It includes excellent applications for RAD (GORM and ProjectCenter). The CD is available for i486, AMD64, Apple Mac PowerPC, and Sun UltraSPARC computers.
Toorox is a Linux live DVD based on Gentoo which starts as bootable media using KNOPPIX technology. It is designed for ease of use, with a simple control center and a hard disk installer. It contains many applications and uses KDE, GNOME, or XFCE as a working environment. A live USB pen drive image maker is also present on the desktop. It is multi-lingual and contains the unstable branch of Gentoo (x86 and amd64).
Goodgoat Linux is a simple to use Linux distribution that can be run from a USB drive, hard drive, or CD-ROM. Rather than overwhelming users with a multitude of applications, it aims to have the best utility for each job. In addition to including the latest software, it makes it easy to share a computer's hard drive over a network.
Userful Live CD is a unique multiseat Linux live CD that lets one computer function as two. Booting from this CD temporarily transforms your dual-monitor PC or laptop (with an extra USB keyboard and mouse) into a "dual-seat" PC, supporting two independent users at the same time, each with their own monitor, keyboard, and mouse. A single keystroke links your keyboards and monitors. The live CD also includes Userful Multiplier and Userful Desktop.
BeatrIX Linux is a 180-megabyte live CD that is also installable to hard drive. It features kernel 2.6.7, Gnome 2.8, Evolution 2.0, Firefox 1.0 with AdBlock, Open Office 1.1.2, Vim, Apt, xPDF and more. It tracks the Ubuntu package repository. It was originally built for the mini-ITX motherboards from Via, but it runs on just about any Pentium-class PC with 64 megs of RAM or more. It's a get-the-job-done distribution for people who want the basics.
Ubuntu Christian Edition is an operating system geared towards Christians. It is based on the popular Ubuntu Linux and includes the best available Christian software, such as GnomeSword, a top of the line Bible study program, and several additional modules. It also includes fully integrated Web content parental controls powered by Dansguardian and a graphical tool for adjusting the parental control filter settings. If you are looking for a KDE-based distribution, consider Ichthux.