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A operating system based on the best Windows NT design principles26,495 weekly downloads
JNode is a Java New Operating system Design Effort. JNode is a simple to use and install Java operating system for personal use on modern devices. Any java application runs on it, fast and safe. See our homepage for additional information.56 weekly downloads
Haiku is an open-source operating system currently in development designed from the ground up for desktop computing.137 weekly downloads
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freeRTOS for Arduino Uno, Goldilocks 1284p & Mega 256090 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 firstname.lastname@example.org weekly downloads
An open source operating system for x86.3 weekly downloads
GaryOS is an entire GNU/Linux system in a single bootable file4 weekly downloads
FreeOS/1 is a Free, Open Source, FreeDOS based Free and Open Source Alternative OS, with open source Microsoft Windows compatibility using HXDOSExtender KernelEx,and ReactOS source code. FreeOS/1 will include new technologies and will be easy to use3 weekly downloads
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K-OS is an open-source realtime-operating-system based on the OSEK/VDX standard aimed at compiler and microcontroller independence. Currently we support Motorola (Freescale) HC12/HCS12/HCS12X targets.2 weekly downloads
Unix-like operating system for the TI-89 and TI-92+ graphing calculators.2 weekly downloads
A fork of ReactOS which aims to be compatible to the NT architecture (but not a clone) meeting WINE's standards every time a part of NT interface is implemented. The fork was done at revision 9494 before ReactOS changed slowly into Tinykrnl.1 weekly downloads
Blueport is an italian Open Source 32-bit operating system ... This project has temporarly moved to Gna.org: <a href="http://gna.org/projects/blueport">Blueport project</a>1 weekly downloads
An operating system written in C & assembly.1 weekly downloads
self-sustaining consult and counsel agency/agent server/client. Root alias is the OS, which runs on Windows/Linux/Talon operates on or independently of all OS through intuitive protocol based parallel wiring diagramming It's really an exciting build. M
Admiral aims to be an OS written in Ada, making available to the user all the advantages of a well-designed & stable system.
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.
AxionOS is (to be) a operating system for the Axion Prototype Computer (APC) which is basically a notebook. Currently the project is in its childhood, but the idea is simple - To create an intuitive, user-friendly operating system for the APC.
BOS – B.lu operating System, is an operating system dedicated to small microcontrollers and CPUs without MMU. Actually is dedicated to Texas Instruments MSP430 microcontrollers (it can be ported to other CPUs without great changes)
Cellocity Linux is Based on Fedora Core 6 Source Code. With only basic core elements needed to operate Compatipal and a completley Graphic Interface as well as Text. Version 2.0 will include more applications 32,64 bit and 80 Core Intel CPU
DragonFly is an operating system and environment designed to be the logical continuation of the FreeBSD-4.x OS series. These operating systems belong in the same class as Linux in that they are based on UNIX ideals and APIs. DragonFly is a fork in the pa
The project aim to create a microkernel-based operating system from scratch.
SDK for Jobo AG's Giga Vu Pro Evolution device. Includes tutorial.
The Isis OS Project Is a Controlled Project to Develop An Advanced Modern Operating System!
Simple OS made for educational purposes. Not preffered for a desktop OS. Made for developers.
Super simplistic x86 real mode operating system.