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EmuTOS is a firmware/OS replacement for the Atari ST computers727 weekly downloads
GrindarsOS - 32bit protect-mode one-task operating system.10 weekly downloads
CMAKE build enviroment for LPC2000 and LPC17xx Cortex MCUs2 weekly downloads
Crossplatform FrameWord writen for oberon1 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