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2. OpenBSD - Wikipedia

   en.wikipedia.org/wiki/OpenBSD

   OpenBSD is a security-focused, free and open-source, Unix-like operating system based on the Berkeley Software Distribution (BSD). Theo de Raadt created OpenBSD in 1995 by forking NetBSD 1.0. [4]

3. Darwin (operating system) - Wikipedia

   en.wikipedia.org/wiki/Darwin_(operating_system)

   Older versions supported some or all of 32-bit PowerPC, 64-bit PowerPC, 32-bit x86, and 32-bit ARM. It supports the POSIX API by way of its BSD lineage (largely FreeBSD userland ), so a large number of programs written for various other UNIX-like systems can be compiled on Darwin with no changes to the source code .

4. OS/2 - Wikipedia

   en.wikipedia.org/wiki/OS/2

   OS/2 (Operating System/2) is a series of computer operating systems, initially created by Microsoft and IBM under the leadership of IBM software designer Ed Iacobucci. [2] As a result of a feud between the two companies over how to position OS/2 relative to Microsoft's new Windows 3.1 operating environment, [3] the two companies severed the relationship in 1992 and OS/2 development fell to IBM ...

5. Windows 10 - Wikipedia

   en.wikipedia.org/wiki/Windows_10

   The 32-bit variants of Windows 10 will remain available via non-OEM channels, and Microsoft will continue to "[provide] feature and security updates on these devices". [284] This was later followed by Windows 11 dropping support for 32-bit hardware altogether, thus making Windows 10 the final version of Windows to have a 32-bit version ...

6. VxWorks - Wikipedia

   en.wikipedia.org/wiki/VxWorks

   VxWorks is a real-time operating system (or RTOS) developed as proprietary software by Wind River Systems, a subsidiary of Aptiv.First released in 1987, VxWorks is designed for use in embedded systems requiring real-time, deterministic performance and in many cases, safety and security certification for industries such as aerospace, defense, medical devices, industrial equipment, robotics ...

7. Windows NT 3.1 - Wikipedia

   en.wikipedia.org/wiki/Windows_NT_3.1

   Windows NT 3.1 is the first major release of the Windows NT operating system developed by Microsoft, released on July 27, 1993.. At the time of Windows NT's release, Microsoft's Windows 3.1 desktop environment had established brand recognition and market share, but it relied on the DOS operating system for essential functions, and it had a constrictive 16-bit architecture.

8. Xbox system software - Wikipedia

   en.wikipedia.org/wiki/Xbox_system_software

   The Xbox system software is the operating system developed exclusively for Microsoft's Xbox home video game consoles. [1] Across the four generations of Xbox consoles, the software has been based on a version of Microsoft Windows and incorporating DirectX features optimized for the home consoles.

9. GEOS (16-bit operating system) - Wikipedia

   en.wikipedia.org/wiki/GEOS_(16-bit_operating_system)

   GEOS-SC was a 32-bit reduced instruction set computer (RISC) CPU smartphone, OS, and GUI for the Japanese cellphone market. It was released in 1997. It was released in 1997. Originally built as GeoWorks' planned future OS and codenamed 'Liberty', GEOS-SC became the basis for cellphones designed by Mitsubishi Electric Company (MELCO) of Japan.