Linux referred to the usually free, unix-like Operating systems based on the Linux kernel and is GNU GPL based software. The large, commercial distribution was from 1992 through the licensing of the Linux kernel under the free GNU GPL. In 1983, Richard Stallman launched the GNU project with the goal to develop an Unix-like, POSIX -compatible operating system.
FOG is a Linux-based, free and open source computer imaging solution for Windows XP, Vista and 7 that ties together a few open-source tools with a php-based web interface. FOG doesn't use any boot disks, or CDs; everything is done via TFTP and PXE. Also with fog many drivers are built into the kernel, so you don't really need to worry about drivers (unless there isn't a linux kernel driver for it).