Boots into many systems and GRUB2 ones!
Super GRUB2 Disk helps you to boot into most any Operating System (OS) even if you cannot boot into it by normal means.
Free operating system for Atari computers, and more.
EmuTOS is a TOS compatible operating system for Atari ST series computers, and more. It is made from Digital Research's GPLed original sources and is a free and open source alternative to Atari proprietary ROMs.
open source analogue of IBM OS/2 operating system