July 4, 1998

• Skyriders OS - (skyrider@hehe.com)
• FLOPS, Frank Lovro's OPerating System - (Strato1@hotmail.com)

March 11, 1998

• Antares OS (kinfira@hotmail.com)
• WinX - A free WindowsNT clone (paganos@hotmail.com)
• ReactOS (jasonfilby@hotmail.com)
• ZEUS OS (Escuela Universitaria Politecnica de La Almunia) [spanish]
• CLoud's Space - Operating Systems Development
• OxygenOS

Februrary 5, 1998

• Nextwork OS (elesende@nextwork.net)

January 22, 1998

• RTEMS - Real-Time Executive for Multiprocessor Systems (rtems@redstone.army.mil)

January 16, 1998

• Freedows '98

January 8, 1998

• KangaroOS - Operating System for i80x86 processors (redhog@algonet.se)

January 7, 1998

• GLUnix Homepage - The Berkeley Network of Workstations (NOW) project

January 1, 1998

• The 86open Project - Unix-on-Intel players work on a common binary (86open@telly.org)

December 22, 1997

• MITUX - Made In Taiwan UNIX (It's strange language, isn't it?)

December 16, 1997

• Afeed - Aiming for Fast Execution of Enhanced Demos. (org.afeed@poboxes.com)

December 11, 1997

• Avios - A VIrtual Operating System on top of Unix [ftp]

December 5, 1997

• The SamOS homepage

December 1, 1997

• Katix Real Time OS (kate@iki.fi)
• Albatross (University of Kaiserslautern, DE)
• PROSE - Parallel Real-time Operating System for Secure Environments
• RoadRunner - RTOS based on the Fairchild real-time kernel

November 30, 1997

• OASYS (fleecy@netreach.net)
• Proposals for the OASYS operating system

November 28, 1997

• Brix (brix@qzx.com)
• Jolt 97 - 32-bit multitasking OS for Intel compatible PCs
• Dolphin (falvosa@borg.com)

November 27, 1997

• MOO32
• NYAOS - Not your average operating system
• The BPMOS 32bit Operating System (csuff@csv.warwick.ac.uk)
• JOS - A free Java based Operating System

List of all known (to me) operating systems:

This page only contains free and alternative operating systems. Do you like general mainstream operating systems ? Look somewhere else!

A

• ACADOS, an Academic Operating System (Univ. of Iowa)
• Aeon Project - Adaptable Extensible Object eNvironment (Trinity College Dublin, DSG)
• Alex FTP Filesystem (Carnegie Mellon Univ.) [ftp]
• Amadeus Project - Distributed Persistent Programming Platform (Trinity College, Dublin)
• Ambrosia - a modular basic real-time operating system in automotive units (Univ. of Hildesheim) [german]
• Antares OS (kinfira@hotmail.com)
• Afeed - Aiming for Fast Execution of Enhanced Demos. (org.afeed@poboxes.com)
• AROS - Amiga OS 3.1 Replacement Project (FH Konstanz)
• • UAE - The Un*x Amiga Emulator (RWTH Aachen)
• Amoeba Distributed Operating System (Vrije Universiteit Amsterdam)
• • House Amoeba Project - An attempt at installing the Amoeba Distributed OS on an array of Kodak KIMS Stations (Rochester Institute of Technology, Computer Science House)
• Albatross (University of Kaiserslautern, DE)
• Andrew File System
• Angel Operating System (City Univ. of London)
• Apertos - Reflective Object-Oriented Operating System (Sony, Inc.)
• Ara Project - mobile agents in heterogeneous networks (Univ. Kaiserslautern)
• Archons Project - distributed real-time computing (E. Douglas Jensen)
• ARGON Operating System Project (alaric@abwillms.demon.co.uk)
• Arjuna Project - Construction of fault-tolerant distributed applications (Univ. of Newcastle upon Tyne)
• Artemis
• AsBestOS - A Persistant Distributed Exo-Kernel Object-Centric OS
• Augmint: A multiprocessor simulator for Intel x86 architectures (Arun Sharma, arsharma@csrd.uiuc.edu)
• Avante Operating System Project (Roland.Nilsson@communique.se)
• Avios - A VIrtual Operating System on top of Unix [ftp]

B

• Brix (brix@qzx.com)
• bpmk - Bits and Pieces Microkernel (will@iki.fi)
• BatOS - Virtual Operating System (Univ. of West Bohemia)
• The BPMOS 32bit Operating System (csuff@csv.warwick.ac.uk)
• Bridge Multiserver Project (Carnegie Mellon Univ.)
• BSD Sockets: A Quick And Dirty Primer (Jim Frost)

C

• Calypso Project - Parallel Processing on Networked Computers (Arizona State Univ. / Courant Institute, New York Univ.)
• CarlOS - Commodity Architecture Research Laboratory Operating System (Institute of Datalogy, Univ. of Kopenhagen)
• Chant: A Talking Threads Package (ICASE, NASA/Langley Research Center)
• CHAOS-CHico's Academic Operating System (California State Univ.)
• Chimera Real-Time Operating System (Carnegie Mellon Univ.)
• Choices Operating System (Univ. of Illinois)
• • Choices OS - Technical Reports and Papers (Univ. of Illinois, Urbana-Champaign) [ftp]
• CLoud's Space - Operating Systems Development
• Coherent Virtual Machine (CVM) (Dr. Pete Keleher)
• Concurrent Programming for Operating Systems Classes Using SR (Drexel Univ.)
• COSY - Concurrent Operating SYstem (Uni Karlsruhe)
• Cthreads - user-level threads package (College of Computing, Georgia Institute of Technology)
• CTRON - Communication and Central TRON (Univ. of Tokyo, Sakamura Lab.)

D

• DemOS Project (Univ. Oslo) (also here)
• DIOMEDES Project (Univ. Hildesheim) [german]
• Distributed Thread Kernel (TU München)
• DOLIB (Distributed Object Library) and DONIO (Distributed Object Network I/O Library) (Oak Ridge National Laboratory)
• Dolphin (falvosa@borg.com)
• Dome: Distributed Object Migration Environment (Carnegie Mellon Univ.)
• DOORS Project - Design of Object-Oriented Real-time Systems (Carleton Univ., Ottawa, Canada)
• DOS: Operating System Basics (UCS Knowledge Base, Indiana Univ.)
• DRAGON SLAYER Project - Distributed Heterogeneous File System (Univ. of Dortmund)
• DROPS - The Dresden Real Time Operating System Project (TU Dresden)

E

• Emerald Project - process and object mobility on a network of workstations (Univ. of Copenhagen)
• Eos Project (North Carolina State Univ.)
• EROS - Extremely Reliable Operating System (Univ. of Pennsylvania)
• Exokernel Operating System (MIT)

F

• Fluid Operating System: System software for massively parallel and distributed systems (Life Electronics Research Center, Japan)
• Flux Operating System Project (Univ. of Utah)
• • Evolving Mach 3.0 to a Migrating Thread Model (Flux Project) (Univ. of Utah) [ftp]
  • Quarks -- a Portable DSM System (Flux Project) (Univ. of Utah)
  • The Utah PA-RISC Code Snapshot (Flux Project) (Univ. of Utah)
  • Utah Lites Release 1.1.u2 (Flux Project) (Univ. of Utah)
• Forth Operating System Project (Maryland)
• FORTWIHR Project (Univ. of Erlangen-Nürnberg)
• • ELiTE - Erlangen Lightweight Thread Environment (Univ. of Erlangen-Nürnberg)
• Freedows '98
• FreeBSD Operating System (Berkeley)
• • FreeBSD 2.1 is now available! (FreeBSD, Inc.)
• Free-DOS Project - totally free - source and everything - MS-DOS compatible operating system (and an european mirror)
• • Free-DOS Project: Pat Villani's DOS-C Kernel (patv@iop.com)

G

• Gang Scheduler - Timesharing on a Massively Parallel Supercomputer (National Energy Research Supercomputer Center)
• GeneSys Project - Generic System-Software (Uni Kaiserslautern)
• Globe Project - Global Object Based Environment (Vrije Univ. Amsterdam)
• GLUnix Homepage - The Berkeley Network of Workstations (NOW) project
• GNUSTEP - The GNU OpenStep Project (FSF) (and a german mirror)
• GOOFEE - Embedded Systems Research & Development
• • CREEM(tm) - Concurrent Realtime Embedded Executive for Microcontrollers
• Grasshopper Operating System (Univ. of Sydney)
• GUIDE Operating System (Grenoble Univ.)

H

• Harmony Real-Time Operating System (National Research Council of Canada)
• Hive Operating System (Stanford Univ.)
• Hurd - the GNU Operating System (FSF)
• • Gordon's Hurd Page (Calgary)
• Hurricane Operating System (Univ. of Toronto)
• HYBRID Project - the Gneiss Kernel (Univ. of Stellenbosch)

I

• Infospheres Project (California Institute of Technology)
• Ition Kernel Page (RCS Netherwood, New Brunswick, Canada)
• ITRON Real-Time Operating System (Sakamura Lab., Univ. of Tokyo)
• ITS - Incompatible Time-sharing System (MIT)

J

• JOS - a free Java based Operating System
• Jolt 97 - 32-bit multitasking OS for Intel compatible PCs
• PROSE - Parallel Real-time Operating System for Secure Environments

K

• KangaroOS - Operating System for i80x86 processors (redhog@algonet.se)
• KAOS - KresT Agent Operating System (Vrije Univ. Brussel)
• Kea Operating System (Univ. of British Columbia, Distributed Systems Group)
• KeyKOS Operating System (Univ. of Pennsylvania)
• Katix Real Time OS (kate@iki.fi)
• KOAN/Fortran-S SVM project (IRISA / INRIA U.R. Rennes, France)

L

• L3 and L4 Operating System (GMD)
• Large File / File System Support Effort (Tom Truscott and Kelly Wyatt)
• Legion Project - A Worldwide Virtual Computer (Univ. of Virginia)
• Lightweight Multiprocessor Kernel - r-kernel (Univ. of British Columbia, Distributed Systems Group)
• Linux (GNU)
• • 3. Internationaler Linux Kongress 1996 [german]
  • Andromeda Project: the first MkLinux distribution (connorbd@cleo.bc.edu)
  • ARM Linux Project
  • ATM on Linux (ETH Zürich)
  • DCE-RPC for Linux (Michael T. Peterson)
  • Debian GNU/Linux Home Page (Debian Association, Inc.)
  • Latest Linux kernel sources, patches, and related items (and a german mirror)
  • ELKS - The Embeddable Linux Kernel Subset
  • Linux (SoftForum)
  • Linux 2.0 logo competition: Cast your vote!
  • Linux 2.0 Penguins
  • Linux/Alpha Project
  • Linux an der RWTH Aachen (RWTH Aachen :-) [german]
  • Linux/AP+ Project - Linux on the Fujitsu AP1000+ (Australian Nationa Univ.)
  • Linux Documentation Project Home Page (and a german mirror)
  • Linux Enterprise Computing (linas@fc.net)
  • Linux for Acorn Machines (King's College London)
  • Linux for Hams (Bruce Perens)
  • Linux for the Commercial Market? (iX Multiuser Multitasking Magazin)
  • Linux FUTURE Project (Deutsche Telekom AG)
  • Linux / GNU / X Information (Caldera, Inc.)
  • Linux in High-Performance Computing (mdw@cs.cornell.edu)
  • Linux International
  • Linux inside - Linux im WWW (TU Chemnitz) [german]
  • Linux Journal Magazine (Specialized Systems Consultants, Inc.)
  • Linux Kernel Changes
  • Linux Kernel Configuration Help Texts (Uni Paderborn)
  • Linux Kernel Enhancement Wish List (Albert Cahalan)
  • Linux-Kernel-Programmierung (Humboldt-Universität zu Berlin)
  • Linux-Magazin [german]
  • Linux/m68k (Geert Uytterhoeven)
  • Linux Mobile-IP Project (Binghamton Univ.)
  • LinuxNET: Mailing List Archives
  • Linux-Newsgruppen (Humboldt-Universität zu Berlin)
  • Linux on Mach Project (Ecole Polytechnique de Montreal)
  • Linux on the IBM ThinkPad (Univ. of Essex, Colchester)
  • Linux on the OSF Microkernel (OSF RI)
  • LINUX.ORK.UK - UK academic mirror
  • Linux Personality for the OSF Mach MK (OSF)
  • Linux Projects Map (Harald Milz)
  • Linux Resources By Topic (spatula@gulf.net)
  • Linux Server Snapshot for Intel x86 (Open Software Foundation, Inc.)
  • LinuxThreads library - kernel-level Posix 1003.1c thread package (Xavier.Leroy@inria.fr)
  • Linux T-Shirt Project Homepage (Stat Design, Inc.)
  • Linux user registration (Harald T. Alvestrand)
  • Linux version 1.3 patches (Sam Shen)
  • Linux-SMP status for Intel MPS (erich@uruk.org)
  • Linux Source Navigator (Ben Walter)
  • MkLinux - Linux for Power Macintosh (Apple, Inc.)
  • Multiprocessor (SMP) Linux Kernel Project (Alan Cox)
  • Nick's page on Linux for PowerMacs (stephen@gr.osf.org)
  • NTFS for Linux (Humboldt-Universität zu Berlin)
  • "Official" Red Hat Linux/AXP (Red Hat Software)
  • Parallel Processing using Linux (pplinux@ecn.purdue.edu)
  • Slackware Professional Linux (Morse Telecommunication, Inc.)
  • Stella 96 - An Atari 2600 Emulator for Linux (Bradford W. Mott)
  • S.u.S.E. GmbH Linux
  • The Custom Linux Kernel Generator
  • The Linux Laptop Home Page
  • The Linux driver Development Kit (LDDK) (clausi@chemie.fu-berlin.de)
  • The Official LinuxNET HomePage
  • Wine FAQ
  • Writing Linux Device Drivers (Michael K. Johnson)
  • Yggdrasil Linux Bible (Yggdrasil Computing, Inc.)
  • UltraPenguin 1.0 - Linux for UltraSPARC
• Locust Project - Distributed Shared Virtual Memory (State Univ. of New York at Stony Brook, CS Department)

M

• Mach Operating System (Carnegie Mellon Univ.)
• • FlexMach Project (Univ. of Utah)
  • Linux on Mach Project (Ecole Polytechnique de Montreal)
  • Lites (Helsinki Univ.)
  • MACH Kernel with VAXELN Runtime Library (TU München)
  • Mach++ (OSF RI Cambridge)
  • Mach4 (Univ. of Utah)
  • • Flux/Mach4 OS Project -- 5 Research Staff Positions available! (Univ. of Utah)
  • Mach Shared Objects Project (Univ. of Utah)
  • Mach-US (Carnegie Mellon Univ.)
  • OSF Mach 3 Code Snapshot (OSF RI) [ftp]
  • RT Mach (Carnegie Mellon Univ.)
  • GNU Mach 1.0 Release [ftp]
• MacMiNT - a Macintosh port of an Atari ST-based UN*X clone (Univ. of Colorado)
• Maruti Real-Time Operating System (Univ. of Maryland)
• Masix Operating System (Blaise Pascal Institute MASI Laboratory)
• MELODY - mission-critical real-time operating system (Univ. of Dortmund)
• MEMSOS Operating System (MEMSY Project) (Uni Erlangen)
• Mentat Project - object-oriented parallel processing system (Univ. of Virginia)
• Message Passing Home Page (RWTH Aachen)
• Midway SVM (Carnegie Mellon Univ.)
• MINIX Operating System (Vrije Universiteit Amsterdam)
• • MacMinix (Drexel Univ.)
  • MINIX Usenet FAQ (Ohio State Univ.)
  • MINIX Info Sheet (Glen Overby)
  • MINIX for Transputers
• MiNT - Das Multitasking Operating System für ATARIs [german]
• Mirage+ - a Distributed Shared Memory System (Univ. of California, Riverside)
• MITUX - Made In Taiwan UNIX (It's strange language, isn't it?)
• MiThOS Real-Time Operating System (Frank Müller, Humboldt-Univ. Berlin)
• MIT Pthreads (MIT)
• Modelling and Analysis of Real-Time Behaviour Project (Uppsala Univ., Sweden)
• MoDiS-Projekt - Modellorientierte verteilte Systeme (TU München)
• • DREAMS - Distributed REsources Adaptively Managing System [MoDIS Project, SFB342] (TU München)
  • Dycos-Nanokernel Project [DREAMS] (TU München)
• MOSCOW Operating System (Julian Hall, Univ. of Warwick)
• MOSIX scalable PC cluster for BSD/OS (Hebrew Univ., Israel)
• Moskito - Modular Operating System Kernel for InTeracting cOmputers (Uni Kaiserslautern)
• MOSS: a new DOS Extender for cross-development from Linux (University of Utah) [ftp]
• MOO32
• Multiscale Computing Project (MIT)
• Multi-Subsystem Protocol Architectures (College of Computing, Georgia Institute of Technology)
• Mungi Operating System (Univ. of New South Wales)

N

• NachOS Operating System (Berkeley Univ.)
• • NachOS (Berkeley Univ.) [ftp]
  • NachOS/486 Operating System (Univ. of Virginia)
• NebFS: The Nebula File System (Pennsylvania State Univ.)
• Nemesis (Pegasus Project, Univ. of Cambridge)
• NetBSD Project
• • RiscBSD - NetBSD for the ARM6+ processor (King's College London)
• NewOS - Ender's new Operating System [german] (FHTW Berlin)
• NeXuS (NXS) Operating System Project (calfolds@aol.com)
• Nexus Project - Multithreaded Runtime System (Argonne National Laboratory)
• Nextwork OS (elesende@nextwork.net)
• NGCS: an Operating System Based on Asynchronous Message Passing [Japanese ;-((]
• NOW Project - system support for using a network of workstations (UC Berkeley)
• • GLUnix (NOW Project) (UC Berkeley)
• NYAOS - Not your average operating system

O

• OASYS (fleecy@netreach.net)
• • Proposals for the OASYS operating system
• Oberon Project Home Page (ETH Zürich)
• • Oberon System - Implementations and Internet Resources list (laden@math.tau.ac.il)
• Odyssey Object Oriented Operating System (Univ. College Cork, Ireland)
• OMOS - An Object Server for Program Execution (Univ. of Utah)
• OPAL Single-Address Space Operating System (Univ. of Washington)
• OpenBSD Operating System - following the 4.4BSD roots
• OS/A65 Operating System (TU Chemnitz)
• OS-x86 Project (chets@eos.net)
• OxygenOS

P

• Paros Operating System (Univ. Politecnica de Cataluna)
• Panda Project - Distributed, concurrent, persistent fine grained object support system (Uni Kaiserslautern)
• Paramecium Project - Operating system support for parallel programming (Vrije Univ. Amsterdam)
• PASSION Project - Parallel And Scalable Software for Input-Output (Syracuse Univ.)
• PEACE - Process Execution And Communication Environment (GMD FIRST Berlin)
• PEPSY-QNS - Performance Evaluation and Prediction SYstem for Queueing NetworkS (Univ. of Erlangen-Nürnberg)
• PFSLib (Parallel I/O on workstations) (TU München) [ftp]
• Pilgrim Project (Univ. of Massachusetts at Amherst)
• Plurix - Verteiltes Betriebsystem (Uni Ulm) [german]
• PM Project - distributed object-oriented operating system (Uni Erlangen)
• Portable Parallel File System (PPFS) (Univ. of Illinois at Urbana-Champaign)
• Prospero - Distributed operating system based on virtual system model (Relcom-Moscow file archive)
• Protection and Sharing through Shared Libraries (Univ. of Notre Dame)
• PURE Project - Portable, Universal Runtime Executive (Univ. of Potsdam)
• Portable Thread Synchronization (Jim Frost)
• POSIX Threads
• Proolix - UNIX-like and POSIX-compatible simple operating system for i8086+

Q

• QUASAR Project - QUAlity Specification and Adaptive Resource management for distributed multimedia systems (Oregon Graduate Institute Of Science & Technology)

R

• R2: A realtime operating system (Kyoto Univ., Tsuda Lab.) [Japanese :-((]
• Raduga ODOOOS Project (Maxim Raevski)
• RCOS - Ron Chernich's Operating System (Central Queensland Univ.)
• ReactOS (jasonfilby@hotmail.com)
• RHODOS Project - ResearcH Orientated Distributed Operating System (Deakin Univ. School of Computing and Mathematics)
• RoadRunner - RTOS based on the Fairchild real-time kernel
• RT++ -- Higher Order Threads for C++ (Research Institute for Symbolic Computation, Johannes Kepler Univ., Linz, Austria)
• RTEMS - Real-Time Executive for Multiprocessor Systems (rtems@redstone.army.mil)
• RTX - Real Time Executive (Mike Podanoffsky)
• RxDOS - MSDOS Compatible Operating System (Mike Podanoffsky)

S

• SAM Distributed Shared Memory System (Stanford Univ.)
• SAMOS Project - Scalable Architecture Multicomputer Operating System (Uni Karlsruhe)
• The SamOS homepage
• SCore Operating System Resarch (New York University) [and here]
• Scout - A Communication-Oriented Operating System (Univ. of Arizona)
• SCS'97 - Super Controlling System
• Secure FileSystem (SFS) for DOS/Windows (Univ. of Auckland)
• SimOS - Machine Simulation Environment (Stanford Univ.)
• SHORE Project - A High-Performance, Scalable, Persistent Object Repository (Univ. of Wisconsin)
• Sombrero: A Very Large Single Address Space Distributed Operating System (Arizona State Univ.)
• SOS: The SOMIW object-oriented Operating System (INRIA)
• SPACE Project - providing operating system services using multiple protection domains (Univ. of California, Santa Barbara)
• SPIN Operating System (Univ. of Washington)
• SPIRITS Project - Supporting Predictable Implementation of Real-Time Systems (Univ. of York)
• Spring Operating System (Sun Microsystems, USA)
• • Springtime at Sun (BYTE Magazine, September 1995)
• Spring Project: Real-Time Computing (Univ. of Massachusetts, Amherst)
• Sprite Operating System (Univ. of California, Berkeley) [ftp]
• STREAM ESPRIT Project - Realtime OS Emulation (RWTH Aachen)
• SUMO Home Page: Support for Multimedia in Operating Systems (Lancaster Univ.)
• SUNMOS Operating System (Sandia National Laboratories)
• • Puma Operating System (Sandia National Laboratories)
  • Unified Kernel Project (Sandia National Laboratories)
  • Puma RTOS Project (Sandia National Laboratories)
• SYNClib Project - Scalable Distributed Synchronization (RWTH Aachen, Chair for Operating Systems)
• Synthetix Project - Tools for adapting systems software (Oregon Graduate Insitute)
• System Software for Multicomputing Project (Carnegie Mellon Univ.)

T

• Tacoma Project - Operating system support for networking agents (Univ. of Tromsx, Norway)
• THESIS Project - Transparent HEterogenous Single Image System (Victoria Univ. of Manchester)
• Tigger Project (Trinity College Dublin)
• TINOS - TINy Operating System (Bart Sekura)
• TimeWare Project (Univ. of Maryland)
• Topsy - A Teachable Operating System
• Tornado Operating System (NUMAchine Project, Univ. of Toronto)
• TreadMarks SVM (Rice Univ.)
• TSF - The Object Oriented Address Translation Simulation Framework (Univ. of Newcastle, Virtual Memory Research Group)
• Tunes Project (École Normale Supérieure, Paris)
• • Why a New OS ? (rideau@clipper.ens.fr)
• The Time Warp Operating System (pls@jpl.nasa.gov)
• ITRON - Industrial TRON

U

• UZI Operating System - a UNIX for the Z280 (Uni Siegen) [ftp]

V

• VINO Operating System (Harvard Univ.)
• Vivaldi Object-Oriented Real-Time Kernel
• VOTE and SODA - Virtual Shared Memory (GMD)
• VSTa Operating System (and a VSTa mailing list by thread)

W

• Wind Tunnel Project (Univ. of Wisconsin)
• WinX - A free WindowsNT clone (paganos@hotmail.com)

X

• x-ATM Toolkit for the x-Kernel (Univ. of Illinois)
• Xinu Operating System (Univ. of Canberra)

Y

• YARTOS - Yet Another Real-Time Operating System (Univ. of North Carolina at Chapel Hill)

Z

• ZEUS OS (Escuela Universitaria Politecnica de La Almunia) [spanish]

Almost all of these links is riped off Sven's OS-projects page, many thanks to him

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