HOWTO: Run a Virtual Machine at Boot, a guide on how you can set up VMware Fusion to automatically launch virtual machines on bootup without logging in.
iSCSI and ZFS, how to get them to play together on FreeNAS.
muLinux, is a Linux distribution for really old PC computers.
Small Kernel Project, aims to develop a Linux kernel with minimal RAM and system requirements. It is mainly intended to run on x86 machines with less than 5MB of RAM.
Ukelele, is a tool to modify the keyboard layout in MacOS X.
Codezero, is a L4 microkernel with hypervisor support.
BeRTOS, a real time operating system for embedded platforms