Name Size UI Family Arch Status Source Lang Medium Notes
Android 54+ MB Linux 32-bit Modern Open-source C++ CD Android x86 1.6-r2
Arch Linux 15+ MB Linux 32-bit Modern Open-source C 9pfs Various packages, including Xorg, Firefox and more
Buildroot Linux 4.9 MB Linux 32-bit Modern Open-source C bzImage Minimal Linux with Lua, ping, curl, telnet
Damn Small Linux 50 MB Linux 32-bit Historic Open-source C CD 4.11.rc2 with Firefox 2.0
ELKS 1.2 MB Linux-like 16-bit Modern Open-source C HD Linux for 8086
NodeOS 14 MB Linux 32-bit Modern Open-source C bzImage Linux with nodejs as /bin/init
Tilck 16 MB Linux-like 32-bit Modern Open-source C HD Tiny Linux-Compatible Kernel
FreeBSD 16+ MB BSD 32-bit Modern Open-source C HD FreeBSD 12.0
NetBSD 23+ MB BSD 32-bit Modern Open-source C HD NetBSD 4.0 with Xorg
OpenBSD 11+ MB BSD 32-bit Modern Open-source C HD OpenBSD 6.6
FiwixOS 4.2+ MB Unix-like 32-bit Modern Open-source C HD With Doom
Minix 30+ MB Unix-like 32-bit Modern Open-source C CD Minix 3.3
Redox 31+ MB Unix-like 32-bit Modern Open-source Rust HD A Unix-like microkernel OS written in Rust
SerenityOS 16+ MB Unix-like 32-bit Modern Open-source C++ HD Web browser, various games and demos
Sortix 67 MB Unix-like 32-bit Modern Open-source C++ CD A small self-hosting Unix-like operating system
Soso 7.6 MB Unix-like 32-bit Modern Open-source C CD A Simple Unix-like operating system
Syllable 28+ MB Unix-like 32-bit Historic Open-source C++ HD A user friendly, POSIX compatible OS
Unix V7 0.5+ MB Unix 32-bit Historic Proprietary C HD
BeOS 5 34+ MB BeOS 32-bit Historic Proprietary C++ HD With Opera 3.62, NetPositive
Haiku 41+ MB BeOS 32-bit Modern Open-source C++ HD Networking (WebPositive), OCaml, 2048, NetHack
AROS Broadway 25+ MB AmigaOS 32-bit Modern Open-source C CD AmigaOS-like graphical OS
Icaros Desktop 60+ MB AmigaOS 32-bit Modern Open-source C CD AmigaOS-like graphical OS
Tiny Aros 17+ MB AmigaOS 32-bit Modern Open-source C CD AmigaOS-like graphical OS
9front 5.2+ MB Plan 9 32-bit Modern Open-source C HD An actively maintained fork of Plan 9
9legacy 13 MB Plan 9 32-bit Historic Open-source C HD A set of patches based on the latest release of Plan 9
ReactOS 17+ MB Windows-like 32-bit Modern Open-source C++ HD QtWeb, LBreakout2, OpenTTD, Bochs, TCC
Windows 1.01 0.7 MB Windows 16-bit Historic Proprietary ASM, C Floppy Reversi, Paint
Windows 2.03 1.8 MB Windows 16-bit Historic Proprietary ASM, C HD Reversi, Paint
Windows 3.0 6.5 MB Windows 16-bit Historic Proprietary ASM, C CD
Windows 3.1 17 MB Windows 16-bit Historic Proprietary ASM, C HD QBasic, Minesweeper, Solitaire
Windows 95 19+ MB Windows 32-bit Historic Proprietary ASM, C HD Age of Empires, FASM, POV-Ray, Hover!
Windows 98 11+ MB Windows 32-bit Historic Proprietary ASM, C HD FreeCell, Hearts, sheep.exe, IE 5
Windows ME 14+ MB Windows 32-bit Historic Proprietary ASM, C HD Visual Basic, Office 97
Windows NT 3.1 18+ MB Windows 32-bit Historic Proprietary C++ HD
Windows NT 3.51 28+ MB Windows 32-bit Historic Proprietary C++ HD Internet Explorer 3 and Visual FoxPro 3.0
Windows NT 4.0 16+ MB Windows 32-bit Historic Proprietary C++ HD
Windows 2000 21+ MB Windows 32-bit Historic Proprietary C++ HD IE 6, K-Meleon, Winamp, Delphi, NetHack and more
86-DOS 0.1 MB DOS 16-bit Historic Proprietary ASM Floppy
Exploring IBM 0.1 MB DOS 16-bit Historic Proprietary ASM Floppy
FreeDOS 0.6 MB DOS 16-bit Modern Open-source ASM, C Floppy nasm, vim, debug.com, Rogue, various demos
FreeGEM 1.6+ MB DOS 16-bit Historic Open-source ASM, C HD Graphical desktop for FreeDOS
Xcom 1.3 MB DOS 16-bit Historic Open-source ASM, C Floppy Graphical desktop for FreeDOS
MS-DOS 4 0.5 MB DOS 16-bit Historic Proprietary ASM Floppy
MS-DOS 6.22 2.4+ MB DOS 16-bit Historic Proprietary ASM HD Doom, Sim City, OCaml 1.0, Turbo C and more
PC-MOS/386 0.7 MB DOS 32-bit Historic Proprietary ASM, C Floppy
PsychDOS 4.6+ MB DOS 16-bit Historic Open-source ASM HD
lEEt/OS 0.5 MB DOS 32-bit Modern Open-source ASM, C Floppy
BleskOS 0.2 MB Custom 32-bit Modern Open-source C CD
Blue Jay 83 KB Custom 16-bit Modern Open-source ASM Floppy
BoneOS 3.0 MB Custom 32-bit Modern Open-source C CD
BootChess 4.0 KB Custom 16-bit Modern Open-source ASM Floppy Chess in a bootsector
CatK 3.2 MB Custom 32-bit Modern Open-source C CD
Crazierl 11 MB Custom 32-bit Modern Open-source C, Erlang Multiboot An Erlang Operating System
Dusk OS 0.4 MB Custom 32-bit Modern Open-source C HD A 32-bit Forth
Floppy Bird 6.5 KB Custom 16-bit Modern Open-source C Floppy
HelenOS 7.9 MB Custom 32-bit Modern Open-source C CD A microkernel-based multiserver OS
Hello v86 512 B Custom 16-bit Modern Open-source ASM Bootsector
House 1.1 MB Custom 32-bit Modern Open-source Haskell Floppy
JX 1.3 MB Custom 32-bit Modern Open-source Java Floppy
KolibriOS 1.3 MB Custom 32-bit Modern Open-source ASM Floppy Various apps, games and demos
Little Kernel 0.4 MB Custom 32-bit Modern Open-source C Multiboot
M/CP 512 B Custom 16-bit Modern Open-source ASM Bootsector The Minimal Control Program
MikeOS 0.2 MB Custom 16-bit Modern Open-source ASM CD
Mobius 1.3 MB Custom 32-bit Modern Open-source C Floppy
Mu 0.2 MB Custom 16-bit Modern Open-source C HD
NanoShell 3.5 MB Custom 32-bit Modern Open-source C CD
NewOS 0.6 MB Custom 32-bit Modern Open-source C++ Floppy
Nope OS 92 KB Custom 32-bit Modern Open-source C CD
Oberon 1.6 MB Custom 32-bit Historic Open-source Oberon HD Native Oberon 2.3.6
QNX 4.05 1.4 MB Custom 32-bit Historic Proprietary C Floppy 1999 demo disk
SectorLISP 512 B Custom 16-bit Modern Open-source ASM Bootsector Bootstrapping LISP in a Boot Sector
Skift 44 MB Custom 32-bit Modern Open-source C++ CD A hobby OS built from scratch using C/C++
Snowdrop 0.4 MB Custom 16-bit Modern Open-source ASM Floppy
Sol OS 0.3 MB Custom 32-bit Modern Proprietary ASM Floppy Simple graphical OS
Still Alive 10 KB Custom 32-bit Modern Open-source C Floppy
T3XFORTH 59 KB Custom 16-bit Historic Open-source ASM Floppy An old-school, plain vanilla FORTH system
TetrOS 512 B Custom 16-bit Modern Open-source ASM Bootsector Tetris that fits into the boot sector
ToaruOS 6.3 MB Custom 32-bit Modern Open-source C CD
bootBASIC 512 B Custom 16-bit Modern Open-source ASM Bootsector A BASIC in 512 bytes of x86 machine code
Pillman 512 B Custom 16-bit Modern Open-source ASM Bootsector A yellow thing eats pills and is chased by monsters
bootLogo 512 B Custom 16-bit Modern Open-source ASM Bootsector Logo language in 508 bytes
bootRogue 512 B Custom 16-bit Modern Open-source ASM Bootsector a roguelike game that fits in a boot sector
dino 512 B Custom 16-bit Modern Open-source ASM Bootsector Chrome's t-rex based bootsector game
Invaders 512 B Custom 16-bit Modern Open-source ASM Bootsector Invaders in a bootsector
Sanos 0.5 MB Custom 32-bit Modern Open-source C HD
sectorforth 512 B Custom 16-bit Modern Open-source ASM Bootsector sectorforth is a 16-bit x86 Forth
Dancy 1.3 MB Custom 32-bit Modern Open-source C CD Dancy Operating System
CuriOS 6.6 MB Custom 32-bit Modern Open-source C HD Simple GUI based OS inspired by AmigaOS
OS64 2.2 MB Custom 32-bit Modern Open-source
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