Linux4Geeks is a LFS-based small distro which works around several problems and issues mainstream Linux distributions have. It offers different versions compiled for each architecture and has all the packages required for a slim installation including a firewall and network administration tools, amongst others.
Local Area Security Knoppix is a 'Live CD' distribution based on Knoppix but with a strong emphasis on security tools and small footprint. There are two different versions of L.A.S. Linux to fit two specific size requirements. There is a 185 MB version and a 210 MB version to fit on MiniCDs of the same size.
LostNIX is a Linux distribution based on the Slackware core. LostNIX is equipped with lostSEC and LostRES, an ncurses based security and package update utility system that updates from a public base constantly. This provides your system with a revolving security and pre-audited/selected update system. It also provides a built-in code sharing auto-update software called LostOPEN. This enables you to make updates to your system in a testing jail, and enables you to publish your modified code to a community directory for others to use on the fly with LostNIX.
MEPIS Linux is a desktop Linux system that is also easy to configure as a dedicated server. It is designed for both personal and business purposes. It includes cutting-edge features such as a live/installation/recovery CD, automatic hardware configuration, NTFS partition resizing, ACPI power management, WiFi support, anti-aliased TrueType fonts, a personal firewall, KDE 3.1.2, and much more.