Kernel Mode Linux

http://www.yl.is.s.u-tokyo.ac.jp/~tosh/kml/

You've all heard of User-Mode Linux (http://user-mode-linux.sf.net/), 
which allows a Linux kernel to be run as an ordinary Linux user program 
with virtualized I/O.  Well, Kernel Mode Linux is the opposite; it allows 
an ordinary Linux user program to run inside the Linux kernel's address 
space. The advantage is that you can mess around in kernel mode while 
using ordinary code, tools and libraries.
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