Hobby operating system, bootloader, kernel, drivers, C library
A BSD-based OS project that aims to provide an experience with MacOS
NVIDIA Linux open GPU kernel module source
Scalable, optimized, secure RTOS for multiple hardware architectures
Tool kit for building highly secure special-purpose operating systems
A cute and educational x86 OS
Simplest kernel for cooperative multithreading
OS bootable from Linux,Windows and others partitions as auxiliary OS
Real time preemptive embedded multi-thread kernel
NetFlow iptables module for Linux kernel
PRTOS is a simple, compact preemptive RTOS for embedded systems
A UNIX-like kernel for the i386 architecture
Mulithreading Arduno library
FreeMiNT is a free alternative OS kernel for Atari systems & clones
Chromium + Ubuntu = Cub Linux
This will be an operating system