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A operating system based on the best Windows NT design principles11,888 weekly downloads
colorForth is, in Chuck Moore's own words: "A dialect of Forth that uses color to replace punctuation. Includes its own operating system. Produces extremely compact programs. Instant compile from pre-parsed source."22 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
Clicker is a project for a Multitasking Open-source operating system written from scratch. based on a modular micro kernel. We want to explore new way of designing and using OSes :) [newz: PCI, NE2K and VBE]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.1 weekly downloads
The Danber project aims to create an operating system where both Windows and Linux programs can be run: it is a Windows NT based kernel, but with UNIX user mode compatibility. Support for both PE and ELF executable formats.1 weekly downloads
A rethinking of the Operating System Ecosystem.1 weekly downloads
Open Source Object Oriented Operating System for Intel 32-bit architecture.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
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,...).
Handix is the OS for the Aura line of simple, inexpensive palmtop-type handhelds, designed by this project.
Cerberus is an attempt at creating flexible and extremely customizable Operating System that can be used on many types of computer systems including desktops, servers, and embedded solutions.
New Linux Based OS primarily for smart devices and PDA's, laptops, and eventually desktops. It offers an alternative to the "embedded" approach. All OS versions and applications will be hosted and then made available to the subscribers of cloud svs
The future of information technology will be based on controlling the flow of natural light. This project is an attempt to establish the code (or software) that will enable this to happen. It involves rewriting an OS from the ground up.
A collection of dozens of entertaining educational programs. Optionally bootable from Floppy, CD, or USB. Only the open source portions of FUZOMA are hosted on Sourceforge. Visit the Project Homepage for the full version of FUZOMA.
GJ Universal OS is a operating system that aims to be binary compatible with windows, while having a nice look and feel.
The Isis OS Project Is a Controlled Project to Develop An Advanced Modern Operating System!
Learn, Adapt, Store, Evolve, and Retrieve
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.
A small multitasking OS to run on 65C816 based systems. Features to include a GUI support for as much HW for the supported systems as possible and a system of system extensions for easy expandability of the OS. The initial Development is being done on the Apple IIgs, with plans to port to the Commodore 64 with a SuperCPU. Eventually there will be ports to other 8 and 16-bit CPUs beginning with the 6502, followed by the z80, 6800, 6809, 8086, PDP-11, and then the TMS9900. Once these are complete there will be 32-bit ports to the 680x0, ARM, MIPS, etc.