AO RTOS is small real time OS based on Active Object concurrency model
Building and running ancient Linux on Windows
Alternative operating system for x86 computers
A cute and educational x86 OS
OS-9/6809 compatible operating system for Tandy CoCo and Dragon
an MS-DOS compatible OS, written in Pascal and i8086 assembly
Simplest kernel for cooperative multithreading
OS bootable from Linux,Windows and others partitions as auxiliary OS
RTOS for Secure, Safe and Real-Time Systems
Real time preemptive embedded multi-thread kernel
Real-Time Embedded Operating System
A UNIX-like kernel for the i386 architecture
Mulithreading Arduno library
Written in pure ASM and Exode with cloud computing in mind.
An indie, hobby operating system
Neptune is a kernel and operating system for x86 PCs.
A advanced graphical operating system.
Embedded Real-Time Operating System (RTOS)
An open source OS written in assembly.