Directory: Operating systems

FreeMiNT is a free, open-source operating system for 16/32bit Atari computers and clones. It is compatible with TOS, but adds a lot of new functionality not available in any other TOS-compatible operating system. Currently it's the only operating system that is still under development.

It's also home of:
XaAES (multitasking GEM AES replacement, part of FreeMiNT now)
MiNTlib (libc for FreeMiNT and TOS, a C standard library)
FDlibm (libm for FreeMiNT and TOS, a C math library)
GEMlib (GEM bindings for writing GEM apps)
MiNTbin (set of, mostly deprecated, tools for manipulation of (Free)MiNT binaries)
and many more...

EmuTOS is a Free operating system for computers based on Motorola 680x0 or ColdFire microprocessors. It features functionality similar to TOS, which powered the Atari ST and its successors between 1985 and 1994.

EmuTOS is extremely flexible. It can run on real hardware as a ROM replacement, bootable floppy, standard executable, cartridge... It is available in 12 languages for 14 different variants. Of course, it also runs happily on any Atari emulator such as ARAnyM, Hatari, or Steem SSE. As Free Software, it can also be recompiled from sources to be completely customized.

The EmuTOS project started in 2001, and it is still being actively developed. Some parts originate in old open-sourced code from Digital Research, while other parts have been developed from scratch. There is no code written by Atari in EmuTOS. It is distributed under the GNU General Public License, version 2 (GPLv2).