[TUHS] Is there a good, even definitive, list of reimplementations of the Unix kernel? What would good cut-off criteria be?

[John Cowan via TUHS]

On Sun, Apr 19, 2026 at 10:20 AM Paul Winalski via TUHS <tuhs at tuhs.org> wrote:

> Linux uses ELF.  What are recent versions of Unix using?

Solaris/Illumos, the major BSDs, QNX, BeOS/Haiku, IBM TPF, Stratus
VOS, RISC OS, and Fuchsia are all Posix (at least), are still
maintained, and have adopted ELF.  PE is used by Windows and its clone
React/OS, the Mono framework for the CL, and UEFI.  Mach-O is used by
iOS as well as macOS.