You can mount a floppy image file as a virtual floppy drive and directly access the contents -- view, edit, rename, delete or create files on a virtual floppy, format a virtual floppy, launch a program on a virtual floppy... almost anything you can do with a real floppy.
 
Download

OKL4 is a high-performance system software platform, built using cutting-edge microkernel technology. It provides developers with the technologies and tools needed to build and deploy innovative, high-performance and secure intelligent devices.
 
Download

Linux-VServer provides virtualization for GNU/Linux systems.  This is accomplished by kernel level isolation. It allows to run multiple virtual units at once. Those units are sufficiently isolated to guarantee the required security, but utilize available resources efficiently, as they run on the same kernel.
Download

Virtual runs on Windows, Linux, Macintosh and OpenSolaris and allow you to host other operating systems.
Download

A tool that allows you to run a VMware virtual machine on your PC.
Download