Comparison of open-source operating systems

These tables compare free software / open-source operating systems. Where not all of the versions support a feature, the first version which supports it is listed.

General information

Name	License	Kernel type	Kernel programming language	Kernel thread support	OS family	Oldest non-EOL version^{[Note 1]}^:{{{3}}}	Forks
Linux	GPL/LGPL	Monolithic with modules	C	1:1	Unix-like	2.6.32.61	No
FreeBSD	BSD; GPL, LGPL software usually included	Monolithic with modules	C	1:1	BSD, Unix-like	8.4	DragonFly BSD
OpenBSD	BSD	Monolithic with modules^{[Note 2]}^:{{{3}}}	C	1:1	BSD, Unix-like	5.4	MirOS
NetBSD	BSD	Monolithic with modules	C	1:1	BSD, Unix-like	5.0	OpenBSD
DragonFly BSD	BSD	Hybrid	C	1:1	BSD, Unix-like	No
OpenSolaris, OpenIndiana	CDDL	Monolithic with modules	C	1:1, M:N	Unix	No
AuroraUX	BSD/CDDL	Monolithic with modules	C, Ada	1:1, M:N	Unix	No
Darwin, OpenDarwin, PureDarwin	APSL	Hybrid	C, C++^{[Note 3]}^:{{{3}}}	1:1	BSD, Unix, Unix-like, OS X	No
MINIX	BSD	Microkernel	C		Unix-like	No
FreeDOS	GPL	Monolithic	C		DOS	1.1
Haiku	MIT	Hybrid	C, C++		BeOS	No	TiltOS
House	BSD		Haskell		own/original	No
KolibriOS	GPL	Monolithic	ASM		MenuetOS	No
MenuetOS	Menuet 64, commerce excluded	Monolithic	ASM		own/original	No	KolibriOS
GNU	GPL	Multiserver Microkernel (Hurd kernel) or Monolithic (Linux-libre kernel, fork of Linux kernel, and other kernels which are not part of the GNU Project)	C	1:1	Unix-like	2.4 on Linux-libre kernel (no on Hurd kernel)	Linux
ReactOS	GPL, LGPL	Hybrid	C, C++		Windows-like	No
L4, Fiasco, Pistachio	Some GPL, some BSD	Microkernel	C++		L4	No
Plan 9	LPL	Hybrid	C	1:1, 1:M Cothread style.	own, Unix informed	No	Inferno, Plan B
AROS	APL	Exokernel	C		AmigaOS	No
Syllable	GPL	Monolithic with modules	C, C++	1:1	Unix-like, BeOS, AmigaOS, POSIX	No
Inferno	GPL, LGPL; MIT		C		Plan 9	No	OzInferno
FreeRTOS	modified GPL	RTOS	C		RTOS	No
NuttX	BSD	RTOS	C		RTOS	No
eCos	modified GPL, eCos	RTOS	C, C++		RTOS	No
RTEMS	modified GPL, BSD, Stanford	RTOS	C and ASM with native support for other languages including C++ and Ada	POSIX, RTEID/ORKID, uITRON	RTOS	4.7.1
HelenOS	BSD	Microkernel	C	M:N	own/original	No
E/OS	GPLv2	Monolithic	ASM, C	1:1	BeOS, Unix-like	No
TempleOS	public domain	Monolithic	HolyC, C, C++		Commodore 64-like	no
Name	License	Kernel type	Kernel programming language	Kernel thread support	OS family	Oldest non-EOL version	Forks

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Supported architectures

Name	x86, i386, IA-32	x86 SMP	Xen	IA-64	x86-64	PowerPC	PowerPC SMP	SPARC32	SPARC SMP	Alpha	MIPS	ARM	XScale	M68k	PA-RISC	OpenRISC	other	hosted mode
Linux	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	FR-V, Cell, ETRAX CRIS, M32R, Xtensa, h8, s390, SuperH	UML, coLinux, MkLinux, Itanium Linux-on-Linux, wombat
FreeBSD^[1]	Yes	Yes	Yes	Yes	Yes	Yes	Yes	No	Yes	No	Yes	Yes	Yes	No	No	No	PC98
OpenBSD^[2]	Yes	Yes	No	No	Yes	Yes	No^{[Note 4]}^:{{{3}}}^[3]	Yes	No	Yes	Yes	Yes	Yes	Yes	Yes	No	SuperH, VAX, m88k
NetBSD^[4]	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	SuperH, ns32k, VAX
DragonFly BSD^[5]	No	No	No	No	Yes	No	No	No	No	No	No	No	No	No	No	No		vkernel
OpenSolaris^[6]	Yes	Yes	Yes	No	Yes	No	No	Yes	Yes	No	No	No	No	No	No	No
AuroraUX^[6]	Yes	Yes	Yes	No	Yes	Yes^{[Note 4]}^:{{{3}}}	No	Yes	Yes	No	Yes^{[Note 4]}^:{{{3}}}	Yes	No	No	No	No
Darwin, OpenDarwin^[7]	Yes	Yes	No	No	Yes	Yes	Yes	No	No	No	No	Yes	No	Yes	No	No		L4/Darwin
MINIX^[8]	Yes	No	No	No	No	No	No	No	No	No	No	Yes	No	No	No	No
FreeDOS	Yes	No	No	No	No	No	No	No	No	No	No	No	No	No	No	No
Haiku	Yes	Yes	No	No	Yes	No	No	No	No	No	No	No^{[Note 4]}^:{{{3}}}^[9]	No	No	No	No
KolibriOS	Yes	No	No	No	Yes	No	No	No	No	No	No	No	No	No	No	No
MenuetOS	Yes	No	No	No	Yes	No	No	No	No	No	No	No	No	No	No	No
GNU	Yes	Yes^{[Note 5]}^:{{{3}}}	Yes^{[Note 5]}^:{{{3}}}	Yes^{[Note 5]}^:{{{3}}}	Yes^{[Note 5]}^:{{{3}}}	Yes^{[Note 5]}^:{{{3}}}	Yes^{[Note 5]}^:{{{3}}}	Yes^{[Note 5]}^:{{{3}}}	Yes^{[Note 5]}^:{{{3}}}	Yes^{[Note 5]}^:{{{3}}}	Yes^{[Note 5]}^:{{{3}}}	Yes^{[Note 5]}^:{{{3}}}	Yes^{[Note 5]}^:{{{3}}}	Yes^{[Note 5]}^:{{{3}}}	Yes^{[Note 5]}^:{{{3}}}	Yes^{[Note 5]}^:{{{3}}}	FR-V, Cell, ETRAX CRIS, M32R, Xtensa, h8, s390, SuperH^{[Note 5]}^:{{{3}}}	UML, Itanium Linux-on-Linux^{[Note 6]}^:{{{3}}}
ReactOS	Yes	Yes	No^{[Note 4]}^:{{{3}}}	No	Yes	No^{[Note 4]}^:{{{3}}}	No^{[Note 4]}^:{{{3}}}	No	No	No	No	Yes	No	No	No	No
L4, Pistachio	Yes	No	No	Yes^{[Note 7]}^:{{{3}}}	Yes^{[Note 7]}^:{{{3}}}	Yes^{[Note 7]}^:{{{3}}}	No	No	No	Yes^{[Note 7]}^:{{{3}}}	Yes^{[Note 7]}^:{{{3}}}	Yes	No	No	No	No
Plan 9	Yes	Yes	Yes	No	Yes	Yes	Yes	Yes^{[Note 8]}^:{{{3}}}	Yes^{[Note 8]}^:{{{3}}}	Yes	Yes	Yes	Yes	Yes^{[Note 8]}^:{{{3}}}	No	No	See^[10]^[11]	lguest, vx32
AROS	Yes	No	No	No	Yes	Yes	No	No	No	No	No	No	No	Yes	No	No		i386-linux, i386-freebsd
Syllable	Yes	Yes	No	No	No	No	No	No	No	No	No	No	No	No	No	No
Inferno	Yes	?	No	No	?	Yes	?	Yes	?	No	Yes	Yes	Yes	Yes^{[Note 8]}^:{{{3}}}	No	No	AMD Am29000,^{[Note 8]}^:{{{3}}} Texas Instruments OMAP	Microsoft Windows, Linux, FreeBSD, Plan 9, OS X, Solaris, Irix, UnixWare,^{[Note 8]}^:{{{3}}} HP-UX,^{[Note 8]}^:{{{3}}} Internet Explorer
FreeRTOS	Yes	No	No	No	No	No	No	No	No	No	Yes	Yes	No	No	No	Yes	AVR, PIC, MSP430, HCS12, 8052, MicroBlaze, Cortex-M3, H8S
eCos	Yes	Yes	No	No	No	Yes	No	Yes	No	No	Yes	Yes	Yes	Yes	No	Yes	CalmRISC, ColdFire, FR-V, h8, Matsushita AM3x, Nios II, NEC V8xx, SuperH	Microsoft Windows, Linux
RTEMS	Yes	No	Xen	No	No	Yes	No	Yes	No	No	Yes	Yes	Yes	Yes	Yes	Yes	Blackfin, Nios II, Coldfire, Texas Instruments C3x/C4x, SuperH, H8S	Linux, Solaris, Cygwin, FreeBSD, multiple CPU simulators
HelenOS	Yes	Yes	No	Yes	Yes	Yes	No	Yes	Yes	No	Yes	Yes	No	No	No	No
E/OS	Yes	No	No	No	No	No	No	No	No	No	No	Yes	No	No	No	No
TempleOS	No	No	No	No	Yes	No	No	No	No	No	No	No	No	No	No	No		QEMU, VirtualBox, etc.
Name	x86, i386, IA-32	x86 SMP	Xen	IA-64	x86-64	PowerPC	PowerPC SMP	SPARC32	SPARC SMP	Alpha	MIPS	ARM	XScale	M68k	PA-RISC	OpenRISC	other	hosted mode

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Supported hardware

General

Name	ATA	SATA	SCSI	USB 3.0	USB 2.0	USB 1.1	FireWire	PCMCIA/PC card	AGP	Nvidia official driver IA-32	Nvidia official driver IA-64	Nvidia official driver AMD64	ATI official driver x86	ATI official driver x86-64	ATI r200 free software driver	ATI r300 free software driver	Nvidia free software driver	Audio	TV tuner, video editing, or webcam
Linux	Yes	Yes	Yes	Yes 2.6.31+^[17]	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes,nv(2d only), nouveau(3d with mesa)	OSS, ALSA	V4L,V4L2
FreeBSD	Yes	Yes	Yes	Yes 8.2+	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	No	No	Yes	Yes	Yes	Yes	Yes
OpenBSD	Yes	Yes	Yes	Yes 5.7+	Yes	Yes	No	Yes	Yes	No	No	No	No	No	Yes^[18]	2d only^[18]	2d only^[19]	Yes	Yes
NetBSD	Yes	Yes	Yes	No 7.0^[20]	Yes	Yes	Yes	Yes	Yes	No	No	No	No	No				Yes	Yes
DragonFly BSD	Yes	Yes	Yes	Yes^[21]	Yes	Yes	Yes	Yes	Yes	No	No	No	No	No				Yes
OpenSolaris	Yes	Yes	Yes		Yes	Yes	Yes	Yes	Yes	Yes	No	Yes	No	No				Yes	V4L2
AuroraUX	Yes	Yes	Yes		Yes	Yes	Yes	Yes	Yes	Yes	No	Yes	No	No				Yes
Darwin, OpenDarwin	Yes	Yes	Yes	Yes		Yes				No	No	No	No	No
MINIX										No	No	No	No	No
FreeDOS	Yes	Yes	Yes	No	No^[22]	No^[22]	No		Yes	No	No	No	No	No	No	No	No	Yes	No
Haiku	Yes	Yes	Yes		Yes	Yes	Yes	No	Yes	No	No	No	No	No	Yes	Yes	Yes	Yes	Yes
KolibriOS	Yes	Yes	No		Yes	Yes		No	No	No	No	No	No	No				Yes	No
MenuetOS	Yes	No	No		Yes	Yes		No	No	No	No	No	No	No				Yes	Yes
GNU	Yes	Yes^{[Note 9]}^:{{{3}}}	Yes^{[Note 9]}^:{{{3}}}		Yes^{[Note 9]}^:{{{3}}}	Yes^{[Note 9]}^:{{{3}}}	Yes^{[Note 9]}^:{{{3}}}	Yes^{[Note 9]}^:{{{3}}}	Yes	No^{[Note 10]}^:{{{3}}}	No^{[Note 10]}^:{{{3}}}	No^{[Note 10]}^:{{{3}}}	No^{[Note 10]}^:{{{3}}}	No^{[Note 10]}^:{{{3}}}	No^{[Note 11]}^:{{{3}}}	No^{[Note 11]}^:{{{3}}}	Yes^{[Note 9]}^:{{{3}}}	Yes^{[Note 9]}^:{{{3}}}	Yes^{[Note 9]}^:{{{3}}}
ReactOS	Yes	Yes	Yes		Yes^[23]	Yes^[23]	No	No	Yes	No	No	No	No	No				Yes
L4, Fiasco, Pistachio										No	No	No	No	No
Plan 9	Yes	Yes	Yes		Yes	Yes		Yes	Yes	No	No	No	No	No				Yes	Yes
AROS	Yes								Yes	No	No	No	own	No			2D only
Syllable	Yes	Yes			Yes	Yes			Yes	No	No	No	No	No				Yes
Inferno	Yes	No	Yes		No	No	No	Yes	Yes	No	No	No	No	No				Yes
FreeRTOS										No	No	No	No	No
eCos	Yes	Yes			Yes	Yes				No	No	No	No	No
RTEMS	Yes							Yes		No	No	No	No	No
HelenOS	Yes	Yes	No		No	Yes	No	No	No	No	No	No	No	No	No	No	No	Yes	No
E/OS	Yes	Yes	Yes		No^[1]	Yes	Yes	Yes	No	No	No	No	No	No				Yes	Yes
Name	ATA	SATA	SCSI	USB 3.0	USB 2.0	USB 1.1	FireWire	PCMCIA/PC card	AGP	Nvidia official driver IA-32	Nvidia official driver IA-64	Nvidia official driver AMD64	ATI official driver x86	ATI official driver x86-64	ATI r200 free software driver	ATI r300 free software driver	Nvidia free software driver	Audio	TV tuner, video editing, or webcam

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Networking

Name	Networking support	NE2000/RTL8029	RTL8139	Gigabit Ethernet	10 Gigabit Ethernet	Wireless LAN	Bluetooth	IrDA
Linux	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes
FreeBSD	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes
OpenBSD	Yes	Yes	Yes	Yes	Yes	Yes	Yes	No
NetBSD	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes
DragonFly BSD	Yes			Yes	Yes	Yes	Yes
OpenSolaris	Yes		Yes	Yes	Yes	Yes	No	No
AuroraUX	Yes		Yes	Yes	Yes	Yes	No	No
Darwin, OpenDarwin	Yes
MINIX	Yes		Yes
FreeDOS	Yes	Yes	Yes
Haiku	Yes	Yes	Yes	Yes		Yes
KolibriOS	Yes	Yes	Yes				No	Yes
MenuetOS	Yes	Yes					No	No
GNU	Yes
ReactOS	Yes	Yes	Yes	Yes	Yes	Yes	No	No
L4, Fiasco, Pistachio
Plan 9	Yes	Yes	Yes	Yes	Yes	Yes	No	No
AROS	Yes	Yes
Syllable	Yes	Yes	Yes	Yes
Inferno	Yes	Yes	Yes	Yes		Yes	No	No
FreeRTOS
eCos	Yes			Yes			Yes
RTEMS	Yes	Yes	Yes	Yes	No	No	No	No
HelenOS	Yes	Yes	Yes	Yes	No	No	No	No
E/OS	Yes	Yes	Yes	Yes	Yes	No^[2]	No	No
Name	Networking support	NE2000/RTL8029	RTL8139	Gigabit Ethernet	10 Gigabit Ethernet	Wireless LAN	Bluetooth	IrDA

Network technologies

Name	Firewall	TCP/IP	IPv6	IPX	PPP	PPPoE	DHCP	bridge	TUN/TAP	ssh	OpenVPN
Linux	netfilter iptables/nftables	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes
FreeBSD	IPFW2, IPFilter, PF	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes
OpenBSD	PF	Yes	Yes	No	Yes	Yes	Yes	Yes	Yes	Yes	Yes
NetBSD	IPFilter, NPF, PF	Yes	Yes		Yes	Yes^{[Note 12]}^:{{{3}}}	Yes	Yes	Yes	Yes	Yes
DragonFly BSD	IPFW2, PF	Yes	Yes	No	Yes	Yes	Yes	Yes	Yes	Yes
OpenSolaris	IPFilter	Yes	Yes		Yes	Yes	Yes	Yes	Yes^{[Note 13]}^:{{{3}}}	Yes	Yes
AuroraUX	IPFilter	Yes	Yes		Yes	Yes	Yes	Yes		Yes	Yes
Darwin, OpenDarwin	IPFW	Yes	Yes				Yes			Yes
MINIX		Yes								Yes
FreeDOS		Yes		Yes	Yes	Yes	Yes			Yes
Haiku	None	Yes	Yes				Yes			Yes	Yes
KolibriOS	None	Yes		No	Yes	No	Yes
MenuetOS	None	Yes		No	No	No
GNU	netfilter iptables/nftables (with Linux-libre and Linux kernel)^{[Note 14]}^:{{{3}}}	Yes	Yes^{[Note 15]}^:{{{3}}}				Yes^{[Note 16]}^:{{{3}}}			Yes
ReactOS		Yes	Yes
L4, Fiasco, Pistachio
Plan 9	ipmux	Yes	Yes	No	Yes	Yes	Yes	Yes	No	Yes	No
AROS		Yes
Syllable		Yes			Yes	Yes	Yes			Yes
Inferno	ipmux	Yes	Yes	No	Yes	Yes	Yes	Yes	No	No	No
FreeRTOS
eCos		Yes	Yes		Yes		Yes			Yes
RTEMS		Yes	No		Yes	Yes	Yes	Yes	Yes
HelenOS		Yes	Yes	No	No	No	Yes	No	No	No	No
E/OS		Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	No
Name	Firewall	TCP/IP	IPv6	IPX	PPP	PPPoE	DHCP	bridge	TUN/TAP	ssh	OpenVPN

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Supported file systems

Name	FAT16, dosfs; FAT32, vfat	NTFS	Ext2	Ext3	XFS	ReiserFS	UFS	UFS2	HFS	HFS+	MINIXfs	BFS	ISO 9660	UDF	NFS	SMBFS	RAM disk, tmpfs	ZFS	Other special file systems
Linux	Yes	Yes^{[Note 17]}^:{{{3}}}^{[Note 18]}^:{{{3}}}	Yes	Yes	Yes	Yes	Yes^{[Note 19]}^:{{{3}}}	Yes^[32]	Yes	Yes^{[Note 20]}^:{{{3}}}	Yes	Yes^{[Note 19]}^:{{{3}}}	Yes	Yes	Yes	Yes	Yes	Yes	9P,^{[Note 21]}^:{{{3}}} FUSE,^{[Note 21]}^:{{{3}}} sysfs,^{[Note 21]}^:{{{3}}} configfs,^{[Note 21]}^:{{{3}}} Reiser4,^{[Note 21]}^:{{{3}}}^{[Note 22]}^:{{{3}}} JFS, Btrfs, UnionFS, Ext4
FreeBSD	Yes	Yes^{[Note 19]}^:{{{3}}}^{[Note 18]}^:{{{3}}}	Yes	Yes^{[Note 19]}^:{{{3}}}	Yes^{[Note 17]}^:{{{3}}}	Yes^{[Note 19]}^:{{{3}}}	Yes	Yes	No	No	No	No	Yes	Yes	Yes	Yes	Yes	Yes	FUSE, nullfs, UnionFS
NetBSD	Yes	Yes^{[Note 19]}^:{{{3}}}^{[Note 18]}^:{{{3}}}	Yes				Yes	Yes		Yes^{[Note 19]}^:{{{3}}}			Yes	Yes^{[Note 19]}^:{{{3}}}	Yes	Yes	Yes	Yes	PUFFS, LFS, EFS
OpenBSD	Yes	Yes^{[Note 19]}^:{{{3}}}	Yes		No	No	Yes	No	No	No	No	No	Yes	Yes	Yes	Yes	Yes	No	AFS
DragonFly BSD	Yes	Yes^{[Note 19]}^:{{{3}}}	Yes	No	No	No	Yes	No	No	No	No	No	Yes	Yes^{[Note 23]}^:{{{3}}}	Yes	Yes	Yes	No	HAMMER, nullfs, PUFFS
OpenSolaris	Yes	Yes ^{[Note 18]}^:{{{3}}}^{[Note 24]}^:{{{3}}}	No	No	No	No	Yes		No	No	No	No	Yes	Yes	Yes	Yes	Yes	Yes	CIFS (native), QFS
AuroraUX	Yes	Yes ^{[Note 18]}^:{{{3}}}^{[Note 24]}^:{{{3}}}	Yes	Yes	No	No	Yes		No	No	No	No	Yes	Yes	Yes	Yes	Yes	Yes	CIFS (native), QFS
Darwin, OpenDarwin	Yes	Yes^{[Note 19]}^:{{{3}}}^{[Note 18]}^:{{{3}}}					Yes		Yes	Yes			Yes	Yes	Yes	Yes
MINIX	Yes	No	Yes								Yes	No
FreeDOS	Yes	No	No	No	No	No	No				No	No	Yes				Yes
Haiku	Yes	Yes ^{[Note 18]}^:{{{3}}}	Yes ^{[Note 25]}^:{{{3}}}	Yes ^{[Note 25]}^:{{{3}}}								Yes	Yes	Yes	Yes	No^{[Note 26]}^:{{{3}}}
KolibriOS	Yes	Yes^{[Note 19]}^:{{{3}}}	Yes^{[Note 19]}^:{{{3}}}	Yes^{[Note 19]}^:{{{3}}}	Yes^{[Note 19]}^:{{{3}}}								Yes				Yes
MenuetOS	Yes
GNU	Yes		Yes	Yes^{[Note 27]}^:{{{3}}}			Yes^{[Note 28]}^:{{{3}}}						Yes		Yes		Yes	No
ReactOS	Yes		Yes	No	No	No	No				No	No
L4, Fiasco, Pistachio	Yes	No
Plan 9	Yes		Yes	No	No	No	No	No	No	No	No	No	Yes	No	Yes	Yes	Yes	No	Fossil, Venti, most system services
AROS	Yes																Yes		SFS, AFFS
Syllable	Yes	Yes^{[Note 19]}^:{{{3}}}	Yes^{[Note 19]}^:{{{3}}}	Yes^{[Note 19]}^:{{{3}}}								Yes	Yes				Yes		AFS
Inferno	Yes	No	No	No	No	No	No	No	No	No	No	No	Yes	No	No	No	Yes		kfs, most system services
FreeRTOS																		No
eCos	Yes		Yes^{[Note 19]}^:{{{3}}}														Yes		MMFS, ROMfs, JFFS2, YAFFS
RTEMS	Yes														Yes		Yes		TarFS, TFTP FS, IMFS, miniIMFS
HelenOS	Yes	No	Yes	Yes	No	No	No	No	No	No	Yes	No	Yes	Yes	No	No	Yes		locfs, exFAT
E/OS	Yes	No	Yes	No	No	No	No	No	No	No	Yes	Yes^{[Note 29]}^:{{{3}}}	Yes	No	Yes	Yes	Yes
Name	FAT16, dosfs; FAT32, vfat	NTFS	Ext2	Ext3	XFS	ReiserFS	UFS	UFS2	HFS	HFS+	MINIXfs	BFS	ISO 9660	UDF	NFS	SMBFS	RAM disk, tmpfs	ZFS	Other special file systems

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Supported file system features

Name	RAID	quota	Resource access control	encryption	other special file system features
Linux	Yes	Yes	Unix, ACL, MAC	Yes	LVM, EVMS
FreeBSD	Yes	Yes	Unix, ACL, MAC	Yes	GEOM, snapshots, background fsck, user-mountable file systems
OpenBSD	Yes	Yes	Unix	Yes
NetBSD	Yes	Yes	Unix, Veriexec	Yes
DragonFly BSD	Yes	Yes	Unix	Yes	HAMMER, Snapshots, Checksumming, Deduplication
OpenSolaris	Yes	Yes	Unix, ACL, MAC	Yes	Solaris Volume Manager, ZFS, snapshots, transparent data repair
AuroraUX	Yes	Yes	Unix, ACL, MAC		Solaris Volume Manager, ZFS, snapshots, transparent data repair
Darwin, OpenDarwin		Yes	Unix, ACL	Yes
MINIX			Unix
FreeDOS			No
KolibriOS			No
MenuetOS			No
GNU			Unix
ReactOS			No
L4, Fiasco, Pistachio
Plan 9	No	No	Unix-like, no root	No	snapshots, venti archival storage, per-process namespace, user-mountable file systems
AROS
Syllable			Unix		64-bit, journaling, extended file attributes
Inferno	No	No	Unix-like, no root	No	per-process namespace, user-mountable file systems
FreeRTOS
eCos
RTEMS
HelenOS	No	No	No	No	No
E/OS	Yes	Yes	Unix	Yes	No
Name	RAID	quota	Resource access control	encryption	other special file system features

Security features

Operating system	Mandatory access control	Software executable space protection	Operating system-level virtualization	Virtualisation	Userspace protection	Others
Linux	SELinux, AppArmor^{[Note 30]}^:{{{3}}}	Exec Shield,^{[Note 30]}^:{{{3}}} PaX^{[Note 30]}^:{{{3}}}	Chroot, namespace and cgroups,^{[Note 31]}^:{{{3}}} Linux-VServer,^{[Note 30]}^:{{{3}}} OpenVZ^{[Note 30]}^:{{{3}}}	KVM	IPFilter, Iptables	grsecurity,^{[Note 30]}^:{{{3}}} RSBAC^{[Note 30]}^:{{{3}}}
FreeBSD	SeBSD,^{[Note 32]}^:{{{3}}}^{[Note 33]}^:{{{3}}} TrustedBSD	ProPolice/SSP^{[Note 34]}^:{{{3}}}	jail		IPFW, PF
Darwin	SEDarwin, TrustedBSD		jail		IPFW
OpenBSD		W^X, ProPolice/SSP^{[Note 35]}^:{{{3}}}			PF
OpenSolaris	TrustedBSD		Solaris Containers	KVM^[46]	IPFilter	RBAC^[47]
AuroraUX	TrustedBSD		Solaris Containers		IPFilter
Plan 9	No	No	per-process namespaces
Inferno	No	No	per-process namespaces

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References

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Apple's Mac OS X site
Info on Mac OS X (last updated 4 March 2002)
Info on Mac OS X Server (last updated 14 February 2002)
The DragonFly BSD home page
The RTEMS home page
Operating System Technical Comparison

Emulator images

Haiku Build Factory

Software and packages

Freecode – mostly Linux
FreeBSD Ports – FreeBSD
FRESHports – FreeBSD
ports.su – OpenBSD
OpenBSD packages and ports – OpenBSD
pkgsrc – NetBSD, Linux, FreeBSD, Solaris, Darwin
OpenSolaris Download Center – OpenSolaris
Nexenta OS packages – OpenSolaris
Autopackage – Linux
Klik – Linux

OpenPKG – Linux, FreeBSD, NetBSD, Solaris
DarwinPorts – Darwin
MINIX 3 – Software – MINIX
FreeDOS – Software – FreeDOS
FSF/UNESCO Free Software Directory – GNU Mach/GNU Hurd, Linux
ReactOS Support Database – ReactOS
Free Software ported to RTEMS
Kamidake (site gone) Kamidake at the Wayback Machine (archived January 14, 2007) – Syllable

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↑ Lua error in package.lua at line 80: module 'strict' not found.
↑ Lua error in package.lua at line 80: module 'strict' not found.
↑ Lua error in package.lua at line 80: module 'strict' not found.
↑ Lua error in package.lua at line 80: module 'strict' not found.
↑ DragonFly Frequently Asked Questions Archived 6 October 2006 at the Wayback Machine
↑ ^6.0 ^6.1 Lua error in package.lua at line 80: module 'strict' not found.
↑ Lua error in package.lua at line 80: module 'strict' not found.
↑ Lua error in package.lua at line 80: module 'strict' not found.
↑ Lua error in package.lua at line 80: module 'strict' not found.
↑ Lua error in package.lua at line 80: module 'strict' not found.
↑ Lua error in package.lua at line 80: module 'strict' not found.
↑ Lua error in package.lua at line 80: module 'strict' not found.
↑ ^18.0 ^18.1 Lua error in package.lua at line 80: module 'strict' not found.
↑ Lua error in package.lua at line 80: module 'strict' not found.
↑ Lua error in package.lua at line 80: module 'strict' not found.
↑ Lua error in package.lua at line 80: module 'strict' not found.
↑ ^22.0 ^22.1 USB with DOS – Limited support for some devices provided by third-party driver.
↑ ^23.0 ^23.1 [3] – Very limited support.
↑ [4]
↑ Lua error in package.lua at line 80: module 'strict' not found.
↑ Lua error in package.lua at line 80: module 'strict' not found.

[7] Lua error in package.lua at line 80: module 'strict' not found.

[8] Lua error in package.lua at line 80: module 'strict' not found.

[10] Lua error in package.lua at line 80: module 'strict' not found.

[11] Lua error in package.lua at line 80: module 'strict' not found.

[12] DragonFly Frequently Asked Questions Archived 6 October 2006 at the Wayback Machine

[opensolarisarch-13] 6.0 ^6.1 Lua error in package.lua at line 80: module 'strict' not found.

[opendarwincompatibility-14] Lua error in package.lua at line 80: module 'strict' not found.

[minixhwreq-15] Lua error in package.lua at line 80: module 'strict' not found.

[16] Lua error in package.lua at line 80: module 'strict' not found.

[21] Lua error in package.lua at line 80: module 'strict' not found.

[22] Lua error in package.lua at line 80: module 'strict' not found.

[28] Lua error in package.lua at line 80: module 'strict' not found.

[openbsd1-29] 18.0 ^18.1 Lua error in package.lua at line 80: module 'strict' not found.

[30] Lua error in package.lua at line 80: module 'strict' not found.

[31] Lua error in package.lua at line 80: module 'strict' not found.

[32] Lua error in package.lua at line 80: module 'strict' not found.

[USB_with_DOS-33] 22.0 ^22.1 USB with DOS – Limited support for some devices provided by third-party driver.

[reactos.org-37] 23.0 ^23.1 [3] – Very limited support.

[54] [4]

[84] Lua error in package.lua at line 80: module 'strict' not found.

[85] Lua error in package.lua at line 80: module 'strict' not found.

[Note 1]

[Note 2]

[Note 3]

[1]

[2]

[Note 4]

[3]

[4]

[5]

[6]

[7]

[8]

[9]

[Note 5]

[Note 6]

[Note 7]

[Note 8]

[10]

[11]

[17]

[18]

[19]

[20]

[21]

[22]

[Note 9]

[Note 10]

[Note 11]

[23]

[1]

[Note 12]

[Note 13]

[Note 14]

[Note 15]

[Note 16]

[Note 17]

[Note 18]

[Note 19]

[32]

[Note 20]

[Note 21]

[Note 22]

[Note 23]

[Note 24]

[Note 25]

[Note 26]

[Note 27]

[Note 28]

[Note 29]

[Note 30]

[Note 31]

[Note 32]

[Note 33]

[Note 34]

[Note 35]

[46]

[47]

v t e Free and open-source software
General	Alternative terms for free software Comparison of open source and closed source Comparison of source code hosting facilities Free software Free software project directories Gratis versus libre Long-term support Open-source software Open-source software development Outline
Software packages	Audio Bioinformatics Codecs Collaboration Configuration management Geophysics Health Mathematics Operating systems Programming languages Routing Statistics Television Video games Web applications Content management systems E-commerce Wireless drivers Word processors Android apps iOS apps Commercial Trademarked Formerly proprietary
History	BSD GNU Haiku Linux Mozilla
Community	Free software movement Open-source movement Organizations Events
Licenses	Apache APSL Artistic Beerware Boost BSD CC0 CDDL EPL GNU GPL GNU LGPL ISC MIT MPL Ms-PL/RL WTFPL zlib
License types and standards	Comparison of free and open-source software licenses Contributor License Agreement Copyfree Copyleft Debian Free Software Guidelines Definition of Free Cultural Works Free license The Free Software Definition The Open Source Definition Open-source license Permissive free software licence Public domain Viral license
Challenges	Binary blob Digital rights management Free and open-source graphics device driver Lack of wireless driver support Hardware restrictions License proliferation Mozilla software rebranding Proprietary software SCO–Linux controversies Secure boot Software patents Software security Trusted Computing
Related topics	The Cathedral and the Bazaar Forking Microsoft Open Specification Promise Revolution OS
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