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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
Arch Hurd 16+ MB
Hurd 32-bit Modern Open-source C HD A port of Arch Linux to the GNU Hurd system
BSD/OS 10+ MB
BSD 32-bit Historic Proprietary C HD A proprietary Unix released in 1993 as BSD/386. Includes gcc and perl5
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 Unix V7 port for x86, including Amsterdam Compiler Kit
BeOS 5 34+ MB
BeOS 32-bit Historic Proprietary C++ HD With Opera 3.62, NetPositive
Haiku 36+ 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 The first release version of Windows
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 CorelDRAW! 2.0, Reversi
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 13+ 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 The first retail version of Windows NT
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 NT 4.0 Service Pack 1
Windows 2000 28+ 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 86-DOS version 1.0
Exploring IBM 0.1 MB
DOS 16-bit Historic Proprietary ASM Floppy Learning program on how to use a computer
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 Contains EDLIN
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 Multi-user and multi-tasking OS
PsychDOS 4.6+ MB
DOS 16-bit Historic Open-source ASM HD ANSI-like graphical desktop for FreeDOS
lEEt/OS 0.5 MB
DOS 32-bit Modern Open-source ASM, C Floppy Graphical desktop for ST-DOS
BleskOS 0.2 MB
Custom 32-bit Modern Open-source C CD Alternative OS for older PCs
Blue Jay 83 KB
Custom 16-bit Modern Open-source ASM Floppy Based on MikeOS
BoneOS 3.0 MB
Custom 32-bit Modern Open-source C CD Simple hobby OS
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 Simple Unix-like kernel
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 Flappy Bird game in a bootsector
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 Small bootsector demo for v86
House 1.1 MB
Custom 32-bit Modern Open-source Haskell Floppy Haskell User's Operating System and Environment
JX 1.3 MB
Custom 32-bit Modern Open-source Java Floppy Java-based operating system
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 An embedded kernel designed for small systems
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 Contains a FORTH and BASIC interpreter and several games
Mobius 1.3 MB
Custom 32-bit Modern Open-source C Floppy POSIX and Win32 compatible OS
Mu 0.2 MB
Custom 16-bit Modern Open-source C HD Minimal-dependency hobbyist computing stack
NanoShell 3.5 MB
Custom 32-bit Modern Open-source C CD Multi-tasked 32-bit OS with Win9x-like GUI
NewOS 0.6 MB
Custom 32-bit Modern Open-source C++ Floppy Cross-platform portable OS
Nope OS 92 KB
Custom 32-bit Modern Open-source C CD Simple OS with BASIC interpreter
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 16-bit hobby OS with GUI
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 Bootable demo that plays "Still Alive" from Portal
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 A hobby OS written from scratch
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
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 Minimalistic 32-bit x86 OS
sectorforth 512 B
Custom 16-bit Modern Open-source ASM Bootsector 16-bit x86 Forth in a bootsector
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 C CD Commodore 64 emulator OS for x86 (slow)
netboot.xyz 1.0 MB
Custom 32-bit Modern Open-source C CD Netboot into various operating systems (slow)
SqueakNOS 20 MB
Custom 32-bit Modern Open-source C, Smalltalk CD Smalltalk as a Standalone OS
Chokanji 4 13+ MB
Custom 32-bit Historic Proprietary C HD A Japanese OS based on the TRON project
Mojo OS 1.4 MB
Custom 32-bit Modern Open-source C++ CD A simple operating system for the x86 architecture
Vanadium OS 0.7 MB
Custom 32-bit Modern Open-source C CD A portable, multi-user Unix-like OS
PrettyOS 0.5 MB
Custom 32-bit Modern Open-source C++ Floppy Simple OS for beginners
Asuro 2.1 MB
Custom 32-bit Modern Open-source Pascal CD Asuro is a hobbyist operating system written in Pascal
XENUS 2.0 MB
Custom 32-bit Modern Open-source C HD The Vanadium OS predecessor

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Version: 0669f7a4 (Sep 13, 2025 19:09)
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