Multiplexed Information and Computing Service
Novell NetWare Monolithic, multitasking real-mode (in early versions), later protected mode
Plan 9 from Bell Labs
ReactOS
Originally Acorn Computers, now maintained by RISC OS Open Ltd
SerenityOS Community-led project (founded by Andreas Kling)
TempleOS Entire OS is a single developer’s creation, including kernel, compiler, editor, and even the shell
The History Of Kyeboard Keyboards are input hardware and don’t have an OS kernel, but their controller architecture evolved
