SpareMiNT

SpareMiNT is a software distribution based on "FreeMiNT", which consists of a MiNT-like operating system (OS) and kernel plus GEM compatible "AES" (Application Environment Services). 
Features and compatibility.
The English language distribution is intended for the Atari ST and derivative m68k computers, clones and emulators, such as the FireBee project or Hatari and ARAnyM. The "MiNT" itself, also once called MultiTOS, provided an Atari TOS compatible OS replacement with multitasking and multi-user switching capabilities and Unix-like operation, all of which the original "TOS" lacked.
The distribution comes with Red Hat's "rpm" utility for managing the source- and binary packages. Unix/Linux-style software can be used, if ported, GEM-programs for TOS can run concurrently. The TOS clone "EmuTOS", instead of Atari's original, can be used as a base to boot a MiNT, and e.g. "XaAES", a modern AES derivate, as essential part of the GEM-GUI (Graphical user interface). 
FreeMiNT, and therefore SpareMiNT, is basically the enhanced and greatly improved derivate, and can be used on today's computers, even on different hardware platforms via emulation or Virtual Machines, thanks to the flexibility of the original MiNT and its components that made further development possible.
Comparable Distributions.
EasyMiNT.
Derived from SpareMiNT is "EasyMiNT", using its software repository and a GEM based installer, providing a folder system similar to the "UNIX Filesystem Hierarchy Standard" and German language translations to programs.
AFROS.
"AFROS" (Atari FRee Operating System) comes as a set of files, creating a TOS compatible operating system; there exists a Live-CD to test. Its key components all consist of Free Software:
AFROS software is available to all Atari and/or TOS compatible platforms, but is optimized to be used with the "ARAnyM" (Atari Running on Any Machine) emulator.
Historical Distributions.
Amongst other efforts, there also was a basic build of a "Debian GNU/MiNT" distribution, with a FreeMiNT "kernel", GNU based "userland software" plus DEB "package management". It should have provided commonly used programs and was based on "Debian GNU/Linux". Similar, more successful projects are Debian GNU/kFreeBSD, Debian GNU/Hurd and, most important, the Linux version. SpearMiNT follows the idea to use a Unix/Linux-like package management and software repository.