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ChibiOS/RT is a free and efficient RTOS designed for deeply embedded applications. It offers a comprehensive set of kernel primitives and supports many architectures: ARM7, Cortex-M0, Cortex-M3, Cortex-M4, PowerPC e200z, STM8, AVR, MSP430, ColdFire, H8S, x86.968 weekly downloads
TomOS is a simple 16 bit operating system for x86. It is based on MikeOS version 2.0.0. It is entirely written in the assembly language. TomOS is an educational project.96 weekly downloads
ELKS is a subset of the Linux kernel that runs on IBM compatible PCs from 8086 up. It is intended to get use out of obsolete old hardware, for use in embedded systems, and as an educational tool. ELKS has been moved to Github to protest SourceForge's installer adware hijacking. This does not directly affect ELKS, but it does affect many major open source projects such as Gimp and FileZilla by attempting to trick the user into installing adware in order to download these programs. I refuse to leave ELKS here with such policies in effect. If you have questions about this, please email email@example.com weekly downloads
XMK is a preemptive multitasking kernel for microcontrollers. Its goal is to provide a RTOS small enough (RAM+ROM) to run on 8bit microcontrollers. XMK provides additional/optional features when scaling up to 16bit and 32bit platforms.11 weekly downloads
Phlox OS and Phlox Microkernel1 weekly downloads
A new advanced customizable graphic menu multi boot and OS loader based on XOSL project with gujin project features, this project integrate too a mini OS to provide certain customizable specialized maintenance tasks before boot partition/load OS target.
Aurora OS is an operating system designed in a microkernel format for all users. The object is to develop a modular, mulitplatform, multitasking Operating System that is simple, effective, and powerful.
An open hardware and software platform, Octobits attempts to recreate the aesthetics of the early eight-bit computer age using cheap, powerful, and readily available modern components.
The Palacios VMM integrated with the Kitten Ligthweight Kernel. Palacios is a lightweight and modular VMM developed by Northwestern University and the University of New Mexico. Kitten is a Lightweight OS Kernel developed by Sandia National Labs.