xOSL (meaning Extended Operating System Loader) is the name of a bootloader, which is a program product class that launches operating systems from a bootable device such as a hard disk or floppy drive. xOSL was originally developed by Geurt Vos.
Read more about XOSL: Basic Appeal, History, Survivability, XOSL2, XOSL-OW, Compatible File-systems, Conclusions