Other Operating Systems
Developers keep making operating systems to call their own. Maybe out of pure vanity we take pride of their programs or set of inter-related programs as an OS. The following list is in alphabetical order.
AROS Research Operating System:
AROS Research Operating System is portable and free of charge desktop environment aiming at being compatible with AmigaOS for FreeBSD or Linux. It runs on at least 700 MHz with floating-point unit (FPU) and 256 MB of RAM.
Atari Running on Any Machine:
ARAnyM (Atari Running on Any Machine) is a virtual machine that can run 32-bit emulation of Atari ST, TT030 and Falcon including TOS, FreeMiNT, MagiC and applications for M68k microprocessor and Graphical Environment Manager (GEM).
Graphic Environment Operating System (8-bit):
GEOS (8-bit) or Graphic Environment Operating System (8-bit) is an 8-bit OS for Commodore 64 and other MOS Technology 6502 computers with a GUI that resembled macOS 5.x developed by Berkeley Softworks in 1986 (then GeoWorks, now Breadbox).
Graphic Environment Operating System (16-bit):
KolibriOS:KolibriOS available in 16- and 32-bit was forked from MenuetOS, but heavily scaled down. Its image comes with several video games and several emulators. It seems like a great OS for gaming.
MenuetOS is written in assembler and fits in a floppy. It needs mouse, i386, 32 MB of RAM and 1 MB Display Vesa 2.0+ LFB. I have not had a chance to use it yet although I have tested KolibriOS, which is based on MenuetOS.
MINIX is open source Unix-like OS written in C. It is the base of Linux distribution (distros). It supports various hardware configurations with minor changes on the kernel or installing it from its source code. Note that MINIX does not come with a GUI hence fully CLI.
MorphOS is an OS compatible with AmigaOS with a combination of open source and proprietary code, especially its kernel. It seems to be marketed as a replacement for macOS on hardware made in the past decade or so.
NewOS is an OS that is under development written in C, C++ and assembler. This OS can fit on a floppy. As per the developers, it is "mostly a kernel with a minimal amount of user space libraries and applications." This means plain CLI, no GUI. If you want to try it, you can run its binaries (located at /usr/local/i386-newos/bin) on FreeBSD, Linux, macOS X or Windows using Cygwin.
ReactOS is a project to create an OS compatible with the Windows NT kernel, DOS, OS/2 and Java subsystems. According to its developing group, this system is 93.8% complete, current version 0.4.6 (several years in I have had fun with ReactOS even running game engine, but I do not what else to do with it.