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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]
freshmeat.net
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]
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]
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]
publicos.freehosting.net
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]
www.doc.ic.ac.uk
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]
goos.sourceforge.net
Modern object-orientated microkernel, focus: flexibility and functionality, instead of speed and compatibility. Coded in C. Description, downloads. [Open Source, GPL]
www.mithrill.org
Modular object-oriented application to index files across networks. Has plug-in type data retrieval system, webserver, peer-to-peer connections for network-wide information gathering, retrieval; has features of OSs, database management systems, distributed networking. Open Source, GPL.
atoms.sourceforge.net
Official site of GNUstep: free implementation of NeXTStep/OpenStep specification.
www.gnustep.org
Collaborative undertaking by an international group of Java programmers and enthusiasts to create free Java OS. [Open Source]
sourceforge.net
Makes 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 type safety of intermediate (byte)code. Open Source.
www.jxos.org
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]
lejos.sourceforge.net
Orthogonally persistent, capability-based secure SASOS using L4 2nd generation microkernel. Goals: Prove SASOSs can run on normal hardware, be as secure as normal OSs; can be as efficient as, and are faster than, normal OSs in some important uses; can be pure SASOSs with all data (even system data) in one address space and no other IPC mechanism is supported by OS. POSIX emulating. [Open Source, GPL]
www.cse.unsw.edu.au
Multitasking environment, written in Java, for all Java programs, can execute many Java applications in unique virtual machine. Descriptions, screenshots, downloads. [Open Source, GPL]
www.geocities.com
Tool designed to teach inner workings of operating systems: simple animated simulated OS and hardware coded in Java. RCOS successor.
sourceforge.net