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A toy operating system built in C++ and x86 assembly.1 weekly downloads
BNL OS is a free, modern operating system based on the design of Windows XP/2003.This is not a Linux based system, and shares none of the unix architecture. Please remember, this is in the development stage, and is not reccommended for everyday use.2 weekly downloads
A Small, Reliable, Compact, Object-Oriented, Portable RTOS(Real-time operating system).2 weekly downloads
Hobbyist operating system using a new microkernel. The objective is to not get bogged down by ancient legacy processor support. The OS is meant to be designed from the ground up, without utilizing any legacy or existing implementations or designs.
NandOS ist ein Betriebsystem.1 weekly downloads
open source analogue of IBM OS/2 operating system
yaMOS stands for: yet another "My Operating System". This is a hobby Operating System, let's see to what it develops... At the moment it's only a kernel written in C++ and Assemly.1 weekly downloads
XSystem Kernel Project - an object-oriented 32-bit protected-mode operating system for IA32-architecture.1 weekly downloads
Project is a library of windows kernel mode drivers. These drivers intercept requests to file system drivers (FSD), filter and logging actions.
A port of the Linux operating system kernel and assorted userspace to the Nintendo Wii.
Turtle OS is an Unix-like OS. It aims to be open source, secure, high performing and portable.
The Apollo Project is an early Pre-Alpha of a Kernel experiment run by Primis Computers.
An operating system for an educational robot based on a Nios II board from Altera. Implemented in Nios II assember and C/C++.
The Portable Operating System is meant to be an all purpose operating system that can suit many needs. Project goals include compatibility with other Unix-like operating systems and complete binary compatibility with Linux.
Codename Five is an operating system kernel, written as an experiment in learning assembler, written from scratch for x86. It is not (purposely) based on any previous operating system.
Haiku is an open-source operating system currently in development designed from the ground up for desktop computing.92 weekly downloads
MightyOS is a serious attempt at making a fast and lightweight Operating System written in C++.
Just Another "X" Object Oriented Operating System An embedded operating system aiming to take advantage of modern object oriented and generic programing.
FOS - open source 32-bit microkernel operating system.
Dynics is an operating system for the 64-bit IBM-compatible PC, focussing on services for dedicated audio and MIDI processing. Dynics turns the PC into a powerfull and stable studio component. This is one step towards the DSC: Dynics Studio Computer.
A little operating system created in order to discover the basis of the modern operating system in practice.
ArchOpen is a project aimed at providing a fast, light and free operating system and applications for portable multimedia devices based on TI DM&DSC chips. It currently supports a lot of Archos multimedia devices (Gmini402,AV400,...).
Real-time, modular, microkernel-based operating system under development for i386. The first goal is to support 32-bit DOS protected mode applications made with DJGPP as well as native applications.48 weekly downloads
OSNOS (Open Source Network Operating System) is an operating system desigend to meet the needs of small to medium networks. It will support server based applications, and will handle routing of packets through the network, and support multi-user logins.2 weekly downloads
Mattise is a simple hobby operating system designed to run fast on 32-bit PCs. A newlib port will be released soon for developers to write their own programs for Mattise.1 weekly downloads