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EmuTOS is a firmware/OS replacement for the Atari ST computers182 weekly downloads
GrindarsOS - 32bit protect-mode one-task operating system.1 weekly downloads
Tesoro is an open source operating system project fully written in x86 Assembler language. The architecture is partially based on some QNX ideas and some fresh ideas. It combines low level assembler coding (e.g. microkernel with extremely fast task switch1 weekly downloads
FOS - open source 32-bit microkernel operating system.
FreeDOS-64 is 64-bit Disk Operating System under development for the AMD64 platform.
open source analogue of IBM OS/2 operating system