boot.kernel.org(BKO)
http://boot.kernel.org/

Our objective is to let users boot their machines with bare minimal requirements on their side, and we will handle most of the problem that you may face in booting. All that user needs is Internet connectivity and a small program (gpxe) to boot the machine. This gpxe program provides network booting facility. You can download these program from our site (available at Downloads section). Also, you can find a list of distributions and tools that can be booted with BKO here. Your small 56KB gpxe program can boot any of these options!