PXE Knife is a tool for booting various floppy based utilities via syslinux, allowing them to be booted off a CD, a hard drive, or over the network via PXE. PXE Knife can be used with a number of commonly used tools such as hard drive manufacturer's utilities, memory testers, Linux recovery disks, Windows password changers, pre-configured PXE Knoppix booters (just add DVD), and a number of other utilities. It takes advantage of syslinux's menu system, so it's easy to navigate.
Gendist is a live CD generator system. It has nice features like multi-distribution CDs, support for grub, isolinux, and gfxboot boot managers, and a modules system for configuring your distribution in live mode. This system is independent from the kernel version (but need unionfs and squashfs support). It only works on Debian Sid or Ubuntu Dapper.
kexec-chooser is a thin wrapper around the kexec tool. It looks in /boot for available kernel images and associated ramdisk images, and will make the appropriate kexec call to load these into memory, and then create a stamp file. On a reboot (init level 6), if the stamp file exists, "kexec -e" will be called to execute the loaded kernel (a "warm reboot") instead of rebooting the machine.
OpenBSD Live-CD Firewall is an OpenBSD-based pf (packet filter) firewall, with NAT, squid, DNS, and a DHCP server (dnsmasq) for internal clients preconfigured. Settings and log files can be saved to a USB device. Saved settings will be restored at the next reboot. Additional security related software is available on the CD (arpwatch, honeyd, ntop, portsentry, etc.)
CADmenu makes ctrl-alt-delete more user-friendly on Linux systems. It displays a menu of actions from which you can choose to shutdown or reboot the machine, enter single user mode, or cancel and return to whatever you were doing. It's straightforward to add your own options to the menu, and it works consistently from text consoles and X.
TFTP Server is a multi-threaded TFTP server, allowing any number of clients to connect simultaneously. It supports tsize, blksize, and interval options, PXE boot, and can be run standalone or as a daemon. Port ranges can be specified to work across firewalls. There is also a single port version, for situations where additional ports cannot be opened.