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Object Operating System, OOS, pronounced ooze; goal: create new OS architecture, which uses filesystem to do many jobs usually done via various means. Design philosophy inspired by Unix, Plan 9, but does many things uniquely, trades compatibility for simplicity. [Freshmeat]
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freshmeat.net: Editorials The Evolution of OS Design  Search for in projects articles comments web results by YAHOO! search Section Main Unix Handhelds Mac OS X Themes login register recover password [Article] add comment [Article] The Evolution of OS Design by James Williams, in Editorials Thu, Mar 22nd...
http://freshmeat.net/articles/view/237/

Lightweight, very modular component-based, multitasking, embedded OS; developed, used for many research projects. Goal: manage fast data streams in multimedia environments; for speed and low overhead has zero copy architecture: passes pointer references to data instead of copying it. [Open Source, GPL]
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The ROME Operating System  G libraries have been added. 12/20/01: ROME build and configuration environment document released. 12/11/01: Bug in HelloWorld! demo fixed. If your demo crashed, download the new version. 12/07/01: New simplified version of ROME Target Builder (RTB) released. 12/04/01: First ROME...
http://rome.sourceforge.net/

Object-oriented OS uses best parts of VMS, Unix, Windows NT. Almost everything in kernel is an object (threads, processes, devices, files, event flags, more) to which one can assign logical names. [Open Source]
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O3ONE The Object Oriented OS  ...
http://www.o3one.org/

Plugin-based architecture: if a feature is unneeded, don't download it or waste storage; Linux and Windows compatible; GUI driven, fully skinable to alter its look; includes voice recognition, interactive help system. [Open Source]
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PublicOS  I am sorry to announce that we had to stop development on PublicOS due to a lack of community support. A new Operating System project is currently being worked on, and the website should be online soon. It will be...
http://publicos.freehosting.net/

Component-based multiuser OS; message-based programming, threadless execution, virtual filesystems to be fully modular programming environment. Some code, clear explanations of design and philosophy. [Open Source]
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 S website has been removed. However, I (Russ) recommend that you check out http www.villagersonline.com...
http://www.deming-os.org/

GO!
Component-based OS, runs natively on i80386+ based PCs. Has novel protection mechanism allowing more OS decomposition and high performance: protection overheads almost 1,000 times less than normal OSs. [Open Source, GPL]
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GO OVERVIEW  Ss aim to bring the benefits of object-orientation enjoyed by applications to operating systems. If successful, systems developers, application developers and users will all benefit. OS designers will benefit from software engineering techniques such as object orientation exceptions, just as...
http://www.doc.ic.ac.uk/~jamm/research/go/overview.html

For developers; want those who like ASM, C/C++ and wish to make an OS for enjoyment and useful tasks such as routers, web servers; full documentation, FAQ, history, news, buglist, downloads, forum. [Open Source, GPL]
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GO! OS HOME NEWS  This pages are intended for developers and provide comprehensive documentation about the project. We hope to hear from developers who like ASM and C/C and really wish to create an OS for their personal enjoyment and useful tasks such as...
http://goos.sourceforge.net/

Microkernel manages hardware, provides some services to core kernel, a Java Virtual Machine (JVM), to support fuzzy logic (claims first OS to do so), object-orientation, parallel and distributed processing. [Open Source, GPL]
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aeon The radically different OS  Though the name aeon was coined today (7:15 PM 20th Dec. 2001 I (V.Ganesh) though of this project when I was in my 3rd semester at ISSC for Master's degree in Computer Science. Actually the word aeon (pronounced ee-on) means...
http://aeonproject.sourceforge.net/

Modern object-orientated microkernel, focus: flexibility and functionality, instead of speed and compatibility. Coded in C. Description, downloads. [Open Source, GPL]
http://www.mithrill.org/

Delicate + Smalltalk; true OO OS, based on Smalltalk concept, intended to be testbed for fresh ideas in computing. Small description, downloads: source, binary, clock. Tar.Gz file. [Open Source, GPL]
http://ballz.ababa.net/bi/sw/delitalk-20020521.tar.gz

Goals: all Java OS, flat memory model, for personal use, simple to use and install, any Java applications to run on it fast and safe. Descriptions, documents, screenshots, downloads. [Open Source, LGPL]
http://jnode.sourceforge.net/

Collaborative undertaking by an international group of Java programmers and enthusiasts to create free Java OS. [Open Source]
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SourceForge.net: JOS Java Operating System  Provide feedback on this page Recently changed page Site Status SF.net Projects JOS Java Operating System Summary JOS Java Operating System Stats RSS Summary Admin Home Page Forums Tracker Bugs Support Requests Patches Feature Requests Mail Docs Screenshots News CVS...
http://sourceforge.net/projects/jos/

JX OS: set of Java components executes on core doing system initialization, CPU context switching, low-level domain management; code organized as components loaded into domains, verified, translated to native code; protection based on only type safety of intermediate (byte)code. [Open Source]
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Overview  Java operating system that focuses on a flexible and robust operating system architecture. The JX system architecture consists of a set of Java components executing on the JX core that is responsible for system initialization, CPU context switching and low-level...
http://www.jxos.org/

Multitasking environment, written in Java, for all Java programs, can execute many Java applications in unique virtual machine. Descriptions, screenshots, downloads. [Open Source, GPL]
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Odiseo Desktop  Java desktop environment licensed under the GPL. Odiseo 1.0 wants to be a desktop for the Jos system. But Odiseo in not only a desktop, Odiseo offers a multitasking envioronment for all java programs. With Odiseo you can execute several...
http://www.geocities.com/innigo.geo/

Tool designed to teach inner workings of operating systems: simple animated simulated OS and hardware coded in Java. RCOS successor.
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SourceForge.net: RCOSjava  Provide feedback on this page Recently changed page Site Status SF.net Projects RCOSjava Summary RCOSjava Stats RSS Summary Admin Home Page Forums Tracker Bugs Support Requests Patches Feature Requests Mail Tasks Docs Screenshots News CVS Files Sponsored Downloads About RCOSjava...
http://sourceforge.net/projects/rcosjava/

Minimal OS kernel for PC based server appliances. Lets you run java server applications without need to install host OS, only need normal Java HotSpot VM and Sanos. Description, documents, downloads, manifesto, links, contact. [Open Source, BSD]
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sanos  C network server appliance operating system kernel for Java and POSIX compliant C applications. This page uses frames, but your browser doesn't support them....
http://www.jbox.dk/sanos/

Tiny Java OS for Lego RCX brick. Like its predecessor TinyVM, has tiny Java runtime, under 32K; works as replacement firmware for Lego; Hitachi H8300 processor. To be ported to more small devices. [Open Source, Mozilla]
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leJOS  Japanese language version of Core Lego Mindstorms is now available on Amazon Japan. I'm not sure when it was released, but there it is. Hopefully our Japanese leJOS users will find it useful. January 18, 2004 11:43 AM The official...
http://lejos.sourceforge.net/