List of real-time operating systems

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This list of Real-time operating systems enumerates real-time operating systems. An RTOS is an operating system in which the maximum time from an input stimulus to an output response can be definitely determined.

Name	License	Source model	Target usage	Status	Platforms	Official site
Ardence RTX	?	?	?	?	?	?
BeRTOS	modified GNU GPL	open source	embedded	active	DSP56K, I196, IA32, ARM, AVR	[1]
ChibiOS/RT	GNU GPL	open source	embedded	active	IA32, ARM, AVR, MSP430	[2]
ChorusOS	?	?	?	?	?	[3]
DNIX	proprietary	?	?	?	?	?
DSOS	?	?	?	?	Texas Instruments 980 minicomputer	?
eCos	GNU GPL	open source	general purpose	active	ARM, H8, IA32, 68000, MIPS, V8xx, SPARC, etc.	[4]
embOS (Segger)	?	?	?	?	?	?
EROS	?	?	?	?	?	[5]
FreeRTOS	modified GNU GPL	open source	embedded	active	ARM, AVR, AVR32, HCS12, IA32, MicroBlaze, MSP430, PIC, Renesas H8/S, 8052	[6]
Fusion RTOS	free	?	semi-general purpose	active	ARM, Blackfin, StarCore, DSP 56800E	[7]
HP-1000/RTE	?	?	?	?	?	[8]
INTEGRITY	?	?	?	active	ARM, XScale, Blackfin, Freescale ColdFire, MIPS, PowerPC, x86	[9]
ITRON	?	?	?	?	?	?
LynxOS	proprietary	?	?	active	Motorola 68010, Intel 80386, ARM, PowerPC	[10]
MenuetOS	?	?	?	?	?	[11]
MERT	?	?	?	?	?	?
MicroC/OS-II	proprietary	?	embedded	active	(many)	[12]
Multiuser DOS	?	?	?	?	?	?
Nucleus RTOS	proprietary	?	embedded	active	?	[13]
Open AT OS	?	?	embedded GSM devices	?	?	[14]
OSE	?	?	?	?	ARM, PowerPC, MIPS, IXP2400, TI OMAP	[15]
OS-9	?	?	?	active	Motorola 6809, Motorola 68000-series	[16]
OSEK	?	?	?	?	?	[17]
Phar Lap ETS	?	?	?	?	?	?
Phoenix-RTOS	?	?	?	?	?	[18]
PikeOS	?	?	?	?	?	[19]
Prex	?	?	?	?	?	[20]
pSOS	proprietary	?	?	discontinued	Motorola 68000	?
QNX	mixed	?	general purpose	active	IA32, MIPS, PowerPC, SH-4, ARM, StrongARM, XScale	[21]
RMX	?	?	?	active	8080, 8086, 80386 or higher	[22]
RSX-11	proprietary	?	?	historic	PDP-11	n/a
RT-11	proprietary	?	general purpose	defunct	PDP-11	n/a
RTAI	?	?	?	?	?	[23]
RTEMS	modified GNU GPL	?	embedded	active	ARM, Blackfin, ColdFire, TI C3x/C4x, H8/300, x86, 68k, MIPS, Nios II, PowerPC, SuperH, SPARC, ERC32, LEON, Mongoose-V	[24]
RTLinux	GNU GPL	open source	general purpose	active	same as Linux	[25]
SHaRK	GNU GPL	open source	?	?	?	[26]
SINTRAN III	?	?	?	?	Norsk Data computers	n/a
Symbian OS	?	?	?	active	ARM	[27]
Talon DSP RTOS	proprietary	?	embedded DSP	active	TMS320	[28]
THEOS	?	?	?	?	?	[29]
ThreadX	proprietary	?	?	active	?	[30]
Transaction Processing Facility	proprietary	?	general purpose	active	IBM System/360 derivatives	[31]
TRON Project	?	?	?	?	?	[32]
TUD:OS	GNU GPL	open source	?	?	IA-32	[33]
UNIX-RTR	?	?	?	?	PDP-11	?
VRTX	?	?	?	?	ARM, MIPS, PowerPC, RISC	[34]
VxWorks	proprietary	?	general purpose	active	ARM, IA32, MIPS, PowerPC, SH-4, StrongARM, xScale	[35]
Windows CE	proprietary	?	?	active	x86, MIPS, ARM, SuperH	[36]
Xenomai	?	?	?	?	?	[37]
µnOS	?	?	?	historic	Motorola 68k	?