The majority of the world uses a default or big tech operating systems, but there are many alternatives out there which may be a better choice. Take a look through our list & see if there is something you like the look of. All links open in new windows.
- 2K
https://dl.acm.org/citation.cfm?id=871061 - 4690 Operating System
https://www.toshibacommerce.com - AcadOS
http://homepage.divms.uiowa.edu/~jones/acados - Acorn RISC OS
https://www.riscosopen.org - AiroCorp
http://airocorp.com - AIX
https://www.ibm.com/it-infrastructure/power/os/aix - Alacris
https://alacris.io - Aleris
https://www.aleris.com - Allegro
https://www.allegro.com - AmigaOS
https://www.amigaos.net - Amiga Unix
http://www.amigaunix.com/doku.php - Amoeba
https://www.cs.vu.nl/pub/amoeba - AMX RTOS
http://www.kadak.com/rtos/rtos.htm - AneedA
https://iamplus.com - Apollo OS
https://github.com/Arawn-Davies/Apollo-OS - Apostle Project
http://apostle.sourceforge.net - AROS
http://aros.sourceforge.net - AtheOS
http://atheos.pyro-os.org - AtomsNet
http://atoms.sourceforge.net - Atomthreads
http://atomthreads.com/index.php - AutoSense OS
https://www.phonak.com/us/en/about-us/autosense-os-technology.html - Azure Sphere
https://azure.microsoft.com/en-us/services/azure-sphere - BareMetal
http://www.returninfinity.com - Bitrig
https://www.bitrig.org - BlackBerry OS
https://global.blackberry.com/en/software/smartphones/blackberry-10-os - BlueEyedOS
http://www.blueeyedos.com - Brew
https://developer.brewmp.com - BS2000
https://www.fujitsu.com/fts/products/computing/servers/mainframe/bs2000 - CapROS
http://www.capros.org - Centrifuge
https://centrifuge.io - Chaos
http://chaosdev.io - ChibiOS
http://www.chibios.org/dokuwiki/doku.php - Chimera RTOS
http://www.cs.cmu.edu/~aml/chimera/chimera.html - Choices
http://choices.cs.illinois.edu - Chromium OS
https://www.chromium.org/chromium-os - Cinder
http://www.scs.stanford.edu/cinder - Cisco IOS
https://www.cisco.com/c/en/us/products/ios-nx-os-software/ios-technologies/index.html - Cisco NX-OS
https://www.cisco.com/c/en/us/products/ios-nx-os-software/nx-os/index.html - Contiki
http://www.contiki-os.org - COS
http://www.china-cos.com - Cosmos
https://www.gocosmos.org - CP/M & CP/M Plus
http://www.digitalresearch.biz/CPM.HTM - Darwin
https://opensource.apple.com - DBOS
https://www.dbos.global - Deos
https://www.ddci.com/products_deos_do_178c_arinc_653 - DesktopBSD
https://www.desktopbsd.net - DexOS
http://dex-os.github.io - DragonFlyBSD
https://www.dragonflybsd.org - DROPS
http://os.inf.tu-dresden.de/drops - DSPnano RTOS
http://rowebots.com/products/dspnano - DTOS
http://www.cs.utah.edu/flux/fluke/html/dtos/HTML/dtos.html - eCos
http://ecos.sourceware.org - EduOS
https://github.com/RWTH-OS/eduOS - EGOS
https://egosllc.com - EMBOS
https://www.segger.com/products/rtos/embos - EmuTOS
http://emutos.sourceforge.net - EOS
https://www.eosworldwide.com - EOSIO
https://eos.io - Erika
http://erika.tuxfamily.org/drupal - Fabric OS
https://www.broadcom.com/products/fibre-channel-networking/software/fabric-operating-system - FlingOS
https://github.com/FlingOS - FortiOS
https://www.fortinet.com/products/fortigate/fortios - FreeBSD
https://www.freebsd.org - FreeDOS
https://www.freedos.org - FreeVMS
http://www.freevms.net - Frenzy
https://distrowatch.com/table.php?distribution=frenzy - Friend OS
https://friendos.com - Fuchsia
https://fuchsia.dev - FullPliant
https://www.fullpliant.org - FxOS
https://www.cisco.com/c/en/us/td/docs/security/firepower/fxos/compatibility/fxos-compatibility.html - GazOS
http://gazos.sourceforge.net - GeekOS
http://geekos.sourceforge.net - Gemini Nucleus
http://gemini.sourceforge.net - GemOS
https://enterprise.gem.co - Genode
https://genode.org - Ghost OS
https://ghostkernel.org - GhostBSD
https://www.ghostbsd.org - GNU
https://www.gnu.org/home.en.html - GNU Hurd
https://www.gnu.org/software/hurd - GNUstep
http://www.gnustep.org - GoOS
https://github.com/nutterts/GoOS - Haiku
https://www.haiku-os.org - HeartOS
https://www.ddci.com/products_heartos - HelenOS
http://www.helenos.org - Hive
https://hiveos.farm - House
http://programatica.cs.pdx.edu/House - HP-UX
https://www.hpe.com/us/en/servers/hp-ux.html - IBM AIX
https://www.ibm.com/it-infrastructure/power/os/aix - IBM z/VSE
https://www.ibm.com/it-infrastructure/z/zvse - Icaros Desktop
https://www.patreon.com/icarosdesktop - IchigoJam
https://na-s.jp/IJBRPi - Illumos
https://www.illumos.org - Inferno
http://www.vitanuova.com - INTEGRITY
https://www.ghs.com/products/rtos/integrity.html - iOS
https://www.apple.com/ios - iPadOS
https://www.apple.com/ipados - iPod software
https://support.apple.com/downloads/ipod - JOS
http://jos.sourceforge.net - Junos
https://www.juniper.net/us/en/products-services/nos/junos - JX OS
http://www4.cs.fau.de/Projects/JX - KaOS
https://kaosx.us - Kaspersky
https://os.kaspersky.com - KolibriOS
https://kolibrios.org - kOS
https://ksp-kos.github.io/KOS - Kronos
https://www.korg.com/us/support/download/software/0/424/1514 - KRUD
https://distrowatch.com/table.php?distribution=krud - KUKA Sunrise.OS
https://www.kuka.com/en-us/products/robotics-systems/software/system-software/sunriseos - Kylin
http://www.kylinos.cn - L4
http://l4hq.org/projects/os - Linux
https://www.linux.com/what-is-linux - LSE/OS
http://lseos.sourceforge.net - LuninuxOS
https://luninuxos.com/about.html - LynxOS
https://www.lynx.com - macOS
https://www.apple.com/macos - Manos
https://github.com/hellertime/manos - MaRTE OS
https://marte.unican.es - Mavericks
https://support.apple.com/downloads/mavericks - MidnightBSD
https://www.midnightbsd.org - MikeOS
http://mikeos.sourceforge.net - Minix3
https://www.minix3.org - Minoca
https://github.com/minoca/os - MenuetOS
http://menuetos.net - MkLinux
http://mklinux.org - Möbius
http://mobius.sourceforge.net - ModulOS
http://modulos.sourceforge.net - MorphOS
https://www.morphos-team.net - MOSIX
http://www.mosix.org - MUTOS
http://www.robotrontechnik.de/index.htm?/html/software/mutos.htm - Nachos
https://www.cs.odu.edu/~cs471/soumya/salsa.html - Nemesis
http://nemesis.sourceforge.net - Nerthus
https://nerthusfoundation.org - NetBSD
https://www.netbsd.org - NewOS
http://newos.org - Nexenta
https://nexenta.com - Nexus
https://www.cs.cornell.edu/people/egs/nexus - Nimbus
https://sourceforge.net/p/nimbusos/wiki/Home - Nintendo Switch OS
https://www.nintendo.com/switch - Node-OS
https://node-os.com - nOS
https://nos.io - Nova
http://repo.nova.cu - Nucleus RTOS
https://www.mentor.com/embedded-software/nucleus - O3ONE
http://www.o3one.org - Oberon
http://www.projectoberon.com - Odin
https://samsungodin.com - On Time RTOS-32
http://www.on-time.com - ONTAP
https://www.netapp.com/us/products/data-management-software/ontap.aspx - Opal
https://homes.cs.washington.edu/~levy/opal/opal.html - OpenBSD
https://www.openbsd.org - OpenIndiana
https://www.openindiana.org - OpenVMS
https://www.vmssoftware.com - OppcOS
http://oppcos.sourceforge.net - OSE
https://www.enea.com/ose - osFree
http://www.osfree.org - OSv
http://osv.io - Paros
http://research.ac.upc.edu/paros - PetrOS
http://www.trumpet.com.au/index.php/products/9-operating-systems/20-petrosr-operating-system.html - Phantom
http://dzavalishin.github.io/phantomuserland - PikeOS
https://www.sysgo.com/products/pikeos-hypervisor - PIOS
http://zoo.cs.yale.edu/classes/cs422/pios - Plan 9 from Bell Labs
https://9p.io/plan9 - PM_SZ_OS
https://www.the-sz.com/products/pm_sz_os - PonyOS
https://ponyos.org - PowerMAX
https://www.dellemc.com - Proolix
http://www.cs.cmu.edu/~brians/comp/proolix.html - PTS DOS
http://phystechsoft.ru/pts-dosl - Puppy Linux
http://puppylinux.com - PureDarwin
http://www.puredarwin.org - PureOS
https://www.pureos.net - QNX
https://blackberry.qnx.com - Quant Network
https://www.quant.network - RadiOS
http://radios.sourceforge.net - RCOSjava
http://rcosjava.sourceforge.net - ReactOS
https://reactos.org - REAL/32
https://winworldpc.com/product/real-32/7x - REBOL-IOS
http://www.rebol.com/index-ios.html - Red Hat Linux
https://www.redhat.com/en/technologies/linux-platforms/enterprise-linux - Red Star OS
https://www.visitthedprk.org/made-in-north-korea-red-star-o-s - Redox
https://www.redox-os.org - Remix OS
http://www.jide.com/en/remixos - REWIN OS
https://www.cht.com - RISC OS Pi
https://www.riscosopen.org/content/downloads/raspberry-pi - Rodos
http://www8.informatik.uni-wuerzburg.de/wissenschaftforschung/rodos - ROME
http://rome.sourceforge.net - RTEMS
https://www.rtems.org - RTOS-UH
http://rtos.iep.de/indexe.htm - RTX
https://www.intervalzero.com - RTXC Quadros RTOS
http://quadros.com/products/operating-systems/rtxc-quadros-rtos-advanced - RxDOS
https://sourceforge.net/projects/rxdos - S.Ha.R.K
http://shark.sssup.it - Safebit
https://safebit.io - Sanos
http://www.jbox.dk/sanos - ScorchOS
https://sourceforge.net/projects/scorchos - ScottsNewOS
http://scottsnewos.sourceforge.net - SCP Foundation Operating System
http://www.scp-wiki.net/forum/t-2050004/scp-foundation-operating-system - SEVMS VAX
https://www.cyber.gov.au/publications/epl/sevms-vax - SharkOS
https://distrowatch.com/table.php?distribution=shark - ShawnOS
https://github.com/shawnanastasio/ShawnOS - Sinclair OS
https://sinclair-uk.weebly.com/sinclair-os.html - SimpleOS
http://sos.enix.org/fr/PagePrincipale - SmartOS
https://www.joyent.com/smartos - Solaris
https://www.oracle.com/solaris - SPIN
http://www-spin.cs.washington.edu - Spinix
http://www.ibiblio.org/spinix/about.html - Spring
https://www.iaps.com/Spring.html - Squeak
http://wiki.squeak.org/squeak/5727 - STARCOS
http://www.arp.com/medias/13438540.pdf - SteamOS
https://store.steampowered.com/steamos - Stratus VOS
https://www.stratus.com/es/solutions/platforms/v-series-continuum-openvos/operating-systems - Stupid Operating System
https://github.com/sos-os/kernel - SymbOS
http://www.symbos.de - Symobi
http://www.symobi.com - Symphony OS
https://distrowatch.com/table.php?distribution=symphony - Talos
https://github.com/talos-systems/talos - TAOS
http://www.uruk.org/emu/Taos.html - TCx Sky Operating System
https://www.toshibacommerce.com - TempleOS
https://templeos.org - The Operating System
http://www.theoperatingsystem.org - THEOS
http://www.theos-software.com - Thix
http://hulubei.net/tudor/thix/index.html - THREADX ROTS
https://rtos.com/solutions/threadx/real-time-operating-system - TI-RTOS Kernel
http://www.ti.com/tool/TI-RTOS-MCU - TinyOS
hhttp://www.tinyos.net - Tizen
https://www.tizen.org - ToaruOS
https://toaruos.org - TORNADO
http://www.tornado-os.com - Torsion
http://www.nongnu.org/torsion - TRON
https://www.tron.org - TRON Network
https://tron.network - TrueOS
https://www.trueos.org - TUD:OS
http://demo.tudos.org - tvOS
https://developer.apple.com/tvos - µ-velOSity
https://www.ghs.com/products/micro_velosity.html - µC/OS
https://www.micrium.com/rtos - UberOS
https://github.com/TsarN/uber-os - UDOS
http://www.sde.cs.titech.ac.jp/~gondow/udos/index.html - Unix
https://www.opengroup.org/membership/forums/platform/unix - UnixWare
https://www.xinuos.com/menu-products/unixware-2018 - V2 OS
https://www.v2.nl/archive/works/v2_os - Veloce OS3
https://www.mentor.com/products/fv/emulation-systems/veloce-apps#os3 - VisiOn
http://www.theoperatingsystem.org/vision-mission - Visopsys
https://visopsys.org - VM/ESA
http://www.vm.ibm.com/techinfo/vmfblank.html - VMS
https://www.vmssoftware.com - VxWorks
https://www.windriver.com/products/vxworks - WatchOS
https://www.apple.com/watchos - Wii U OS
http://nintendotoday.com/wii-u-operating-system - Windows/Windows NT
https://www.microsoft.com/en-us/windows - Xbox 360 OS
https://support.xbox.com/en-US/xbox-360/console/system-update-operating-system - Xbox One
https://support.xbox.com/en-US/browse/xbox-one/console/System%20update - Xinu
https://xinu.cs.purdue.edu - Xinuos OpenServer
https://www.xinuos.com/menu-products/openserver-10 - xMach
http://xmach.sourceforge.net - XTS-400
https://www.baesystems.com - Yamit
https://sourceforge.net/p/yamit/wiki/Home - z/VM
https://www.ibm.com/it-infrastructure/z/zvm - z/OS
https://www.ibm.com/it-infrastructure/z/zos - Zephyr
https://www.zephyrproject.org - ZevenOS
https://www.zevenos.com - Zorin OS
https://zorinos.com
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