EMUTOS - ABOUT
EmuTOS is a Free operating system for computers based on Motorola 68000 or ColdFire microprocessors. It features functionality similar to TOS, which powered the Atari ST and its successors between 1985 and 1994. EmuTOS can run on real hardware, either as ROM replacement or from floppy. Of course, it also runs happily on any Atari emulator such as ARAnyM, Hatari, or Steem SSE.
EmuTOS is Free Software, so it is better than TOS in several ways:
It can be freely used and redistributed with emulators, in respect of the GPL licence. This way, users can run legacy third-party software on emulators without requiring copyrighted Atari ROMs, thereby avoiding legal issues.
It can be improved, to support more features and more hardware than Atari TOS.
It is actively developed and supported.