waitfordevice is a tool that waits for a device to become available. One can use this, for example, when waiting for a USB device to be fully ready after modprobing the USB subsystem (which runs async). This tool can be used in startup scripts or other scripts that need to use a device. It is better guaranteed to work (and more efficient) than using a couple of sleep statements.
HeavenOS is an original, alternative 32-bit operating system for Intel 80386 compatible processors. It is made with NASM (The Netwide Assembler), and is not intended to compare to modern operating systems, but to try to get the best features and discover better ways to do things. It is intended to be a simple and pratical platform for development, running with a small amount of code.
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.
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.
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.
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.