This article lists open source operating systems without systemd in the default installation.

The Android operating system uses a Linux kernel. Wikipedia :: Android

• Android-x86 DW Android O/S, ported to x86 platform (bootable on x86 hardware). Supported architectures: i386, x86_64
  • AndEX Oreo 8.1 runs apps from Aptoide App Manager and Google Play Store on touchscreen x86 laptop
• AOSP Android Open Source Project
• LineageOS (2) successor of CyanogenMod
• Replicant (2) is the free (libre) version of Android. FSF-approved

• FreeBSDDW amd64, arm, i386, and so on
  • BSD Router ProjectDW (BSDRP) an embedded free and open source router distribution; i386, amd64
  • ClonOSDW platform for virtual environment creation and management; amd64
  • GhostBSDDW amd64; GTK3 graphical libraries featured
  • HardenedBSDDW (3) a security-enhanced fork of **FreeBSD; amd64
  • MidnightBSDDW (3) GNUstep graphical libraries featured
  • TrueOS (formerly: PC-BSD) OpenRC; desktop/workstation oriented; Lumina desktop environment; amd64 (the “Pico” release also supports arm)
  • FreeBSD subprojects tailored for embedded devices
    • FreeNASDW
    • NAS4FreeDW
    • OPNsenseDW (based on FreeBSD and pfSense) tailored for firewalls and routers. amd64 and i386
    • pfSenseDW virtual appliances as liveUSB or embedded devices
    • RaspBSDDW special build of FreeBSD (2016) for RaspberryPi and other embedded devices; desktops: Openbox and LXDE; armhf

See also Wikipedia:Comparison of BSD operating systems

• DragonFlyBSDDW
• NetBSD(2) emphasizes portability, across many architectures
  • MirBSD aka “MirOS”
• OpenBSDDW emphasizes portability, standardization, correctness, proactive security and integrated cryptography
  • Bitrig (2) focuses on using modern tools, e.g. git and LLVM/clang; and targets only modern platforms, e.g. amd64, armv7
  • Fuguita (architecture: i386) Japanese
• PureDarwin

• Hurd
  • Arch GNU/Hurd
  • Debian GNU/Hurd
  • GNU/Hurd
• Inferno

• MINIX (2) microkernel O/S, with user mode divided into small, insulated modules to enhance system reliability

• illumos (formerly OpenSolaris) derivatives
  • DilOS
  • OmniOS OmniOS Community Edition (illumos)
  • OpenIndiana(2) (modern OpenSolaris, illumos)
  • SmartOS(2) (illumos)
  • Tribblix (2) an OpenSolaris-derived distribution with a retro feel, based on the illumos core
  • v9os (2) server-only, IPS-based minimal SPARC distribution of illumos
  • XStreamOS(2) (illumos kernel)

• Plan 9 derivatives
  • 9atom
  • 9front
  • 9legacy
  • Harvey OS
  • Plan 9 from Bell Labs (mirror)
  • Plan B

• Redox
• Sortix

• Akaros
• AmayaOS
• AROS Research Operating System
• FreeDOS
• FreeVMS
• Genode (also: SculptOS)
• HaikuDW
• HelenOS
• KolibriOSDW
• MenuetOS
• Minoca OS
• NitrOS-9
• Oberon
• osFree (2) open source OS/2 analogue
• ReactOSDW

• DistroWatch search
• OS for PPC lists non-systemd-encumbered operating systems for PowerPC
• OS for Sparc64 lists non-systemd-encumbered operating systems for Sparc64