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Operating system projects

This repository aims to count and list the open source and historical operating system projects.

For more information and documentation on historical and current (commercial) operating systems and on operating system design and implementation, visit the osdev repository.

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Summary

In the first section we have the classification of operating systems in families. In this case, both established commercial products and systems projects (hobbies) are available. In the second section, the same projects are classified according to the languages ​​used for their development. More information about each is also displayed, such as the target architecture, whether it is an active project, whether it is available on GitHub, and more information about the license used. There will always be links to the project's main repository (or another repository that can be used).

A quick summary of the sections in this document:

• Operating Systems sorted by family
• Operating Systems sorted by language

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OS projects sorted by family

In this session, the projects were separated by the operating system family to which they belong/declare. You can go straight to each repository by clicking on the project name. In the next section you can get more information about each of them.

UNIX and direct descendants

• Version 1 to Version 7 UNIX
• Version 10 UNIX
• UNIX System V
• UNIX PDP-7
• Plan 9 from Bell Labs
• 9front
• 4.4BSD-Lite2
• FreeBSD
• NetBSD
• OpenBSD
• DragonFly BSD
• MirBSD
• illumos (OpenSolaris)

Unix-like

• The Apollo Project
• aquaBSD
• Asterisk
• AquilaOS
• BeeOS
• Brutal
• dahliaOS
• Darwin (XNU kernel)
• Dennix
• duckOS
• eduOS-rs
• Escape
• Fiwix
• Fuchsia OS
• GNU Hurd
• Gramado
• Harvey
• HelenOS
• Hexagonix
• KnightOS
• Lemon OS
• Linux (kernel)
• lk
• Lunix OS
• magma
• MentOS
• Mimiker
• Minix
• Nanvix
• NexNix
• nightingale
• OS67
• qword-OS
• SeaOS
• SerenityOS
• Sortix
• Soso
• Tilck
• ToaruOS
• TravorOS
• TROPIX (NCE/UFRJ)
• Tupai
• µnix
• Unix-like
• Uzi
• UZIX
• Upanix
• Vanadium OS
• xv6
• Yagura
• ZeldaOS

DOS (Disk Operating System)

• AtieDOS
• FreeDOS
• JSD/OS
• MS-DOS
• NetDOS/32
• NightKernel
• Public Domain Operating System
• PC-MOS/386
• PX-DOS
• SimpleOS

Windows and Windows-like

• ReactOS

BeOS-like

• Haiku
• NewOS

Other (original design)

• ackOS
• Alotware
• Amiga Research Operating System
• Asuro
• Aura
• AwooOS
• aurora-xeneva
• azOS
• Banana Operating System
• BareMetal
• BCOS
• Beelzebub
• BetaOS
• Bin S.O
• BleskOS
• BlueKernel
• BoneOS
• Carbon
• ChaiOS
• Cloudium OS
• Cthulhu OS
• Cyjon
• Dawn OS
• DreamOS
• DreamOS64
• Dux
• Einherjar
• ErdOS
• Everest OS
• Fling OS
• FoxOS
• FROST
• Fudge
• FuzzyOS
• GeckOS version 2
• Ghost OS
• Gubernatrix
• GreenteaOS
• HeliX
• HelloOS
• Hoho
• Hydrogen
• HypnoticOS
• Interim
• JaeOS
• JSLK
• Kan
• KiddieOS_Development
• KLIKA-OS
• Kolibri OS
• Kora OS
• KOS
• Kot
• Lambda OS
• LFOS
• Lotus-Effect
• Lyre
• MajickOS
• Managarm
• MenuetOS
• Metta
• Mezzano
• MicroBe OS
• mikanos
• MikeOS
• Minoca
• Minos
• MiraiOS
• mkfreeOS
• MollenOS
• MOROS
• mos
• Mu
• MysticOS
• Nano16
• Nano32
• NanoShellOS
• NOS
• OLOS
• OS
• OSv
• OS/K
• OS/Z
• opuntiaOS
• PastaOS
• PC/GEOS
• Perception
• pidi-os
• PiscisOS
• Plan 42
• PlusOS
• Polaris
• PowerNex
• PrettyOS
• primus-os
• Q Operating System
• Quark Operating System
• QuasiOS
• RDOS
• Reaver OS
• Red OS
• Redox-OS
• RISC OS
• Segmented Kernel (educational)
• seL4
• SerpaeOS
• Silcos
• SingOS
• SivelkiriaOS
• skiftOS
• Snowdrop OS
• SnowflakeOS
• SO3
• SynapseOS
• The Stupid Operating System
• Synergy OS
• tachyon
• tatOS
• TempleOS
• Theseus
• Thor Operating System
• TinyOS
• Týndur
• Tysos
• Unet Operating System
• Ultibo Core
• ultronOS
• U365
• Visopsys
• VSTa
• WingOS
• XEOS
• xOS
• YaxOS
• ZealOS
• Zeal 8-bit OS

Mainframe OS

• MVS/380
• uDOS

• Go back to summary

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OS projects sorted by language

In this session, the projects were separated by the main programming language used. You can also look at information like:

• Architecture;
• Operating system family;
• If the project is hosted on GitHub;
• If the project is active (commits more recent than 4 years);
• License of each project.

Let's take a shortcut! Choose below a language used to write operating system projects:

Assembly language

Name	Language	Architecture	OS family	Available on GitHub	Active	License
Version 1 to Version 7 UNIX	Assembly (early versions) and C	PDP-7, PDP-11	Unix	Yes	No (historical)
UNIX PDP-7	Assembly	PDP-7	Unix	Yes	No
Alotware	Assembly	x86	Other	Yes	No	Public domain
AtieDOS	Assembly	x86 (16-bit)	DOS	Yes	Yes
azOS	Assembly	x86 (16-bit)	Other	Yes	No
BareMetal	Assembly	x86	Other	Yes	No
Bin S.O	Assembly	x86 (16-bit)	Other	Yes	No
BleskOS	Assembly	x86	Other	Yes	Yes
Cloudium OS	Assembly	x86	Other	No	Yes	Unknown
Cyjon	Assembly	x86_64	Other	Yes	Yes
Everest OS	Assembly	x86 (16-bit)	Other	Yes	No
HelloOS	Assembly	x86	Other	Yes	No
Hexagonix	Assembly	x86	Unix-like	Yes	Yes
KiddieOS_Development	Assembly	x86 (16-bit)	Other	Yes	Yes
KnightOS	Assembly	Texas Instruments Calculators	Unix-like	Yes	Yes
Kolibri OS	Assembly	x86	Other	No	Yes	GPLv2
MenuetOS	Assembly	x86, x86_64	Other	No	Yes	GPL
MicroBe OS	Assembly	x86	Other	No	Yes	Unknown
MikeOS	Assembly	x86 (16-bit)	Other	No	Yes	BSD-like
Minos	Assembly	x86	Other	Yes	Yes
MS-DOS	Assembly	x86 (16-bit)	DOS	Yes	No (historical)
Mu	Assembly, Forth	x86	Other	Yes	Yes
NightKernel	Assembly	x86	DOS	Yes	No
OLOS	Assembly	x86 (16-bit)	Other	Yes	Yes
PC/GEOS	Assembly	x86	Other	Yes	Yes
PC-MOS/386	Assembly	x86	DOS	Yes	No
PiscisOS	Assembly	x86	Other	Yes	No
Segmented Kernel (educational)	Assembly	x86	Other	Yes	Yes	MIT license
Snowdrop OS	Assembly	x86 (16-bit)	Other	No	Yes	Public domain
tatOS	Assembly	x86	Other	Yes	No
Unix-like	Assembly	x86	Unix-like	Yes	Yes	MIT license
xOS	Assembly	x86	Other	Yes	No
Zeal 8-bit OS	Assembly	Z80	Other	Yes	Yes

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Basic

Name	Language	Architecture	OS family	Available on GitHub	Active	License
FROST	Basic (FreeBasic)	x86	Other	Yes	Yes

• Go up

C

Name	Language	Architecture	OS family	Available on GitHub	Active	License
Version 10 UNIX	C	-	Unix	Yes	No (historical)
UNIX System V	C	PDP-11, VAX 11/780, x86	Unix	No	No (historical)	Check files
Plan 9 from Bell Labs	C	x86	Unix	No	Yes	-
9front	C	x86	Unix	No	Yes	-
4.4BSD-Lite2	C	x86, PowerPC, MIPS	Unix	Yes	No	BSD license
FreeBSD	C	x86, ARM, PowerPC, RISC-V	Unix	Yes	Yes
NetBSD	C	x86, ARM, PowerPC, RISC-V	Unix	Yes	Yes
OpenBSD	C	x86, ARM, PowerPC, RISC-V	Unix	Yes	Yes
DragonFly BSD	C	x86_64	Unix	Yes	Yes	BSD license
MirBSD	C	x86	Unix	No	Yes	BSD license
illumos (OpenSolaris)	C	x86, SPARC	Unix	Yes	Yes
Amiga Research Operating System	C	m68k, x86, x86_64, PowerPC, ARM	Other (Amiga)	Yes	Yes
The Apollo Project	C	x86, Raspberry Pi Model 4B	Unix-like	Yes	Yes
Asterisk	C	x86	Unix-like	Yes	Yes
aquaBSD	C	x86_64	Unix (FreeBSD)	Yes	Yes
AquilaOS	C	x86	Unix-like	Yes	Yes
AwooOS	C	x86, x86_64	Other	Yes	Yes
Banana Operating System	C	x86	Other	Yes	Yes
BeeOS	C	x86	Unix-like	Yes	Yes
BlueKernel	C	x86	Other	Yes	Yes	Creative Commons Attribution-NonCommercial-NoDerivatives 4.0
BoneOS	C	x86	Other	Yes	Yes
Brutal	C	x86, x86_64, ARM, RISC-V	Unix-like	Yes	Yes
Carbon	C	x86	Other	Yes	Yes
Cthulhu OS	C	x86_64	Other	Yes	Yes
Darwin (XNU kernel)	C	x86_64, ARM, ARM AArch64, PowerPC	Unix-like	Yes	Yes
DreamOS	C	x86	Other	Yes	No
DreamOS64	C	x86_64	Other	Yes	Yes
duckOS	C, C++	x86	Unix-like	Yes	Yes
Dux	C	x86	Other	Yes	No
Einherjar	C	x86_64, PowerPC	Other	Yes	Yes
Escape	C, C++	x86, x86_64, ECO32, MMIX	Unix-like	Yes	Yes
Fiwix	C	x86	Unix-like	Yes	Yes
FreeDOS	C	x86 (16-bit)	DOS	Yes	Yes
Fudge	C	x86, ARM	Other	Yes	Yes
FuzzyOS	C	x86	Other	Yes	Yes
Fuchsia OS	C, C++	x86_64, ARM, ARM AArch64	Unix-like	No	Yes	Apache
GeckOS version 2	C	6502	Other	Yes	Yes
GNU Hurd	C	x86	Unix-like	No	Yes	GPL
Gramado	C	x86	Unix-like	Yes	Yes
Harvey	C	x86	Unix (Plan 9)	Yes	Yes
HelenOS	C, C++	x86, x86_64, i64, ARM, SPARC	Unix-like	Yes	Yes
HeliX	C	x86	Other	Yes	Yes
Hoho	C	x86	Other	Yes	Yes
HypnoticOS	C	x86	Other	Yes	Yes
Interim	C	x86, x86_64, ARMv7, Motorola 68020	Other	Yes	Yes
JaeOS	C	x86	Other	Yes	Yes
JSLK	C	x86	Other	Yes	Yes
Kan	C	x86	Other	Yes	Yes
KLIKA-OS	C	x86_64	Other	Yes	Yes
Kora OS	C	x86, x86_64, ARM	Other	Yes	Yes
KOS	C	x86	Other	Yes	Yes
Lambda OS	C	x86, ARMv7	Other	Yes	Yes
LFOS	C	x86_64	Other	Yes	Yes
Linux (kernel)	C	x86, x86_64, ARM, ARM AArch64, SPARC, PowerPC, RISC-V, [...]	Unix-like	Yes	Yes
lk	C	x86, ARM	Unix-like	Yes	Yes
Lotus-Effect	C	x86	Other	Yes	Yes
Lunix OS	C	x86	Unix-like	Yes	Yes
Lyre	C	x86_64	Other	Yes	Yes
magma	C	x86	Unix-like	Yes	Yes
MentOS	C	x86	Unix-like	Yes	Yes
Mimiker	C	x86, MIPS, AArch64, RISC-V	Unix-like	Yes	Yes
Minix	C	x86, arm64	Unix-like	Yes	Yes
Minoca	C	-	Other	Yes	Yes
MiraiOS	C	x86_64	Other	Yes	Yes
MollenOS	C	-	Other	Yes	Yes
mos	C	-	Other	Yes	Yes
Nano16	C	x86 (16-bit)	Other	Yes	Yes
Nano32	C	x86	Other	Yes	Yes
NanoShellOS	C	x86	Other	Yes	Yes
Nanvix	C	x86	Unix-like	Yes	Yes
NetDOS/32	C	x86	DOS	Yes	No
NexNix	C	x86	Unix-like	Yes	Yes
NewOS	C	x86	BeOS-like	Yes	Yes
nightingale	C	x86	Unix-like	Yes	Yes
opuntiaOS	C	x86, ARM	Other	Yes	Yes
OS67	C	x86	Unix-like	Yes	Yes
OSv	C	x86, ARM AArch64	Other	Yes	Yes
OS67	C	-	Other	Yes	Yes
PastaOS	C	x86	Other	Yes	Yes
pidi-os	C	x86	Other	Yes	Yes
Polaris	C	-	Other	Yes	Yes
primus-os	C	x86	Other	Yes	Yes
Public Domain Operating System	C	x86 (16-bit, 32-bit)	DOS	No	Yes	Public Domain
PX-DOS	C	x86 (16-bit)	DOS	Yes	No
Q Operating System	C	x86_64	Other	Yes	No
qword-OS	C	x86_64	Unix-like	Yes	No
ReactOS	C	x86	Windows	Yes	Yes
Red OS	C	x86	Other	Yes	No
SeaOS	C	x86_64	Unix-like	Yes	No
seL4	C	-	L4	Yes	Yes
SerpaeOS	C	x86	Other	No	Yes	GPLv3
SimpleOS	C	x86	DOS	Yes	Yes
SnowflakeOS	C	x86	Other	Yes	No
Sortix	C	x86, x86_64	Unix-like	No	Yes	ISC license
Soso	C	x86	Unix-like	Yes	Yes
SynapseOS	C	x86	Other	Yes	Yes
Synergy OS	C	x86	Other	Yes	No
tachyon	C	x86_64	Other	Yes	Yes
TempleOS	C	x86	Other	No	No	Public domain
Tilck	C	x86	Unix-like	Yes	Yes
TinyOS	C	x86	Other	Yes	Yes
ToaruOS	C	x86_64, ARMv8	Unix-like	Yes	Yes
TravorOS	C	x86	Unix-like	Yes	No
TROPIX (NCE/UFRJ)	C	x86	Unix-like	Yes	No
Tupai	C	x86, ARM	Unix-like	No	Yes	GNU General Public License version 3
Uzi	C	z80	Unix-like	Yes	Yes	Public domain
UZIX	C	z80, MSX	Unix-like	No	No	GPL
Vanadium OS	C	x86	Unix-like	Yes	Yes
xv6	C	x86	Unix-like	Yes	Yes
Yagura	C	x86	Unix-like	Yes	Yes
ZealOS	C (HolyC)	x86_64	Other (TempleOS)	Yes	Yes
ZeldaOS	C	x86, x86_64	Unix-like	Yes	Yes

• Go up

C++

Name	Language	Architecture	OS family	Available on GitHub	Active	License
ackOS	C++	x86	Other	Yes	Yes
aurora-xeneva	C++	x86_64	Other	Yes	Yes
Beelzebub	C++	x86, x86_64	Other	Yes	Yes
ChaiOS	C++	x86	Other	Yes	Yes
Dennix	C++	x86_64	Unix-like	Yes	Yes
duckOS	C++	-	Unix-like	Yes	Yes
ErdOS	C++	x86	Other	Yes	No
FoxOS	C++	x86	Other	Yes	Yes
Ghost OS	C++	x86	Other	Yes	Yes
GreenteaOS	C++	x86	Other	Yes	Yes
Haiku	C++	x86, ARM	BeOS-like	Yes	Yes
JSD/OS	C++	x86	DOS	Yes	Yes
Kot	C++	x86_64	Other	Yes	Yes
LemonOS	C++	-	Unix-like	Yes	Yes
Managarm	C++	-	Other	Yes	Yes
mikanos	C++	-	Other	Yes	Yes
mkfreeOS	C++	x86	Other	Yes	Yes
NOS	C++	x86, x86_64, ARM, ARM AArch64	Other	Yes	Yes
Perception	C++	x86_64	Other	Yes	Yes
Plan 42	C++	x86	Other	Yes	No	Public Domain
Quark Operating System	C++	x86	Other	Yes	No
Reaver OS	C++	x86_64	Other	Yes	Yes
SerenityOS	C++	x86	Unix-like	Yes	Yes
Silcos	C++	x86	Other	Yes	Yes
skiftOS	C++	-	Other	Yes	Yes
Thor Operating System	C++	x86_64	Other	Yes	Yes
ultronOS	C++	x86	Other	Yes	No
µnix	C++	Raspberry Pi Pico	Unix-like	Yes	Yes
Upanix	C++	x86	Unix-like	Yes	Yes
WingOS	C++	x86_64	Other	Yes	No

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C#

Name	Language	Architecture	OS family	Available on GitHub	Active	License
Fling OS	C#	x86	Other	Yes	Yes
Tysos	C#	x86_64	Other	Yes	Yes

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Common Lisp

Name	Language	Architecture	OS family	Available on GitHub	Active	License
Mezzano	Common Lisp	-	Other	Yes	Yes

• Go up

D

Name	Language	Architecture	OS family	Available on GitHub	Active	License
PowerNex	D	x86_64	Other	Yes	Yes

• Go up

Pascal

Name	Language	Architecture	OS family	Available on GitHub	Active	License
Asuro	Pascal (FreePascal)	x86	Other	No	Yes	Apache License 2.0
Ultibo Core	Pascal	Raspberry Pi	Other	Yes	Yes

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Swift

Name	Language	Architecture	OS family	Available on GitHub	Active	License
BetaOS	Swift, C	x86	Other	Yes	Yes

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Rust

Name	Language	Architecture	OS family	Available on GitHub	Active	License
Aura	Rust	x86	Other	Yes	Yes
eduOS-rs	Rust	x86	Unix-like	Yes	Yes
MOROS	Rust	x86	Other	Yes	Yes
Redox-OS	Rust	x86, ARM	Other	Yes	Yes
snarkOS	Rust	-	Other	Yes	Yes
The Stupid Operating System	Rust	-	Other	Yes	Yes
Theseus	Rust	-	Other	Yes	Yes

• Go back to summary