रीयल-टाइम प्रचालन तंत्रों की तुलना

यहाँ सकाल प्रचालन तंत्रों (RTOS) की तुलना की गयी है। सकाल प्रचालन तंत्र (रीयल टाइम ऑपरेटिंग सिस्टम) उन प्रचालन तंत्रों को कहते हैं जो अलगा इनपुट आने के पहले ही वर्तमान इनपुट को प्रक्रमित कर देते हैं।

नाम	लाइसेन्स	स्रोत मॉडल	लक्ष्य किए गए उपयोग	स्टैटस	प्लेटफॉर्म	आधिकारिक वेबसाइट
Abassi	Proprietary	closed	embedded	active	AVR32, ATmega, ColdFire, Cortex-A53, Cortex-A9, Cortex-M0, Cortex-M3, Cortex-M4, MSP430, PIC32, TMS320C2000, 80251, 8051	www.code-time.com/products.html
AMOS	Proprietary	?	commercial	closed	680x0, 683xx, x86 via emulation	www.alphamicro.com
AMX RTOS	Proprietary	closed	embedded	active	680x0, 683xx, ARM, ColdFire, MIPS32, PowerPC	www.kadak.com/rtos/rtos.htm
Apache Mynewt	Apache 2.0	open	embedded	active	ARM Cortex-M, MIPS32, Microchip PIC32, RISC-V	mynewt.apache.org
Arm Mbed OS	Apache 2.0	open source	embedded	active	Cortex-M, Cortex-R, Cortex-A	os.mbed.com
uKOS	GNU GPL	open source	embedded	active	Cortex-M3-M4-M7-H7, 6833x, PIC, CSEM icyflex-1, STM32	www.ukos.ch
ARTOS (Locamation)	Proprietary	closed	power-system automation	active	x86	www.locamation.com
ARTOS (Robotu)	Proprietary	?	embedded, robots	defunct	ARM9+	www.robotu.com/ARTOS/Welcome.html
Atomthreads	BSD	open source	embedded	active	AVR, STM8, ARM, MIPS	atomthreads.com
AVIX	Proprietary	closed	embedded	active	Atmel AT91SAM3(U/S), EFM32, NXP LPC1300-1700, ST Micro STM32, Texas Instruments LM3S, Toshiba TMPM330, Microchip PIC32MX-PIC24F-PIC24H-dsPIC30F-dsPIC33F	www.avix-rt.com
BeRTOS	modified GNU GPL	open source	embedded	archived	ARM, Cortex-M3, ARM ARM7TDMI, Atmel AVR, PowerPC (emu), x86 (emu), x86-64 (emu)	www.bertos.org
BOOS Core	GNU GPL	open source	embedded	active	ARMv5TEJ (TI AM18x), DSP (TI TMS320C64x)	www.baigudin.software/boos/
BRTOS	MIT	open source	embedded	active	Freescale Kinetis (ARM Cortex-M4), Freescale Coldfire V1, Freescale HCS08, ST STM32F4xx (ARM Cortex-M4F), NXP LPC11xx (ARM Cortex-M0), NXP LPC176x (ARM Cortex-M3), Renesas RX600 (RX62N), Texas Instruments MSP430, Texas Instruments Stellaris LM3S8968 (ARM Cortex-M3), Texas Instruments Stellaris LM4F120H5QR (ARM Cortex-M4F), Atmel ATMEGA328/128 and Microchip PIC18	github.com/brtos/brtos
CapROS	GNU GPL	open source	embedded	active	IA-32, ARM9	www.capros.org
ChibiOS/RT	Mixed, GNU GPL or proprietary	open source	embedded, small footprint	active	x86, ARM7, ARM9, Cortex-M0-M3-M4, PowerPC e200z, STM8, STM32, AVR, MSP430, ColdFire, H8S	www.chibios.org/dokuwiki/doku.php, sourceforge.net/projects/chibios
ChorusOS	?	?	?	defunct	SPARC, x86, PowerPC	docs.sun.com/app/docs/prod/chorus5
ChronOS	GNU GPL	open source	research, general purpose	active	x86, ARM	chronoslinux.org
CoActionOS (now Stratify OS)	Modified GNU GPL or proprietary	open source	embedded	discontinued	ARM Cortex-M3, LPC17xx	www.coactionos.com
cocoOS	BSD	open source	embedded	active	AVR, MSP430, STM32	www.cocoos.net
Concurrent CP/M, became MP/M	Proprietary	closed (meanwhile: open source)	general purpose, industrial	historic	8080, Z80, 8086	Digital Research
Concurrent DOS, became Multiuser DOS	Proprietary	closed	general purpose, industrial	defunct	8086, 286, 386, 68000, (also 8080/Z80 in dual-processor variants)	Digital Research
Contiki	BSD	open source	embedded, WSN	active	MSP430, AVR, ARM	www.contiki-os.org
COS	Proprietary	closed	process control	defunct	GEC 4000 series	?
CooCox CoOS	BSD	open source	general purpose	active	STM32, NXP LPC1000, TI LM3S8962, Nuvoton NU1xx,Holtek HT32	www.coocox.org/CoOS.htm
Deos	Proprietary	closed	safety critical	active	x86, PowerPC, MIPS	www.ddci.com/products_deos.php
DioneOS	Proprietary	available for licensee	embedded	active	MSP430, MSP430x	www.elesoftrom.com.pl/en/os
distortos	Mozilla	open source	embedded	active	ARMv6-M architecture (ARM Cortex-M0, ARM Cortex-M0+, ARM Cortex-M1): STM32F0, STM32L0; ARMv7-M architecture (ARM Cortex-M3, ARM Cortex-M4(F), ARM Cortex-M7(F)): STM32F1, STM32F4, STM32F7, STM32L4	distortos.org
DNIX	Proprietary	closed	general purpose	defunct	68000	?
dnx RTOS	GNU GPL, modified GPL, BSD	open source	embedded (Unix-like)	active	ARM Cortex-M3, STM32	www.dnx-rtos.org
GEC DOS	Proprietary	closed	process control	defunct	GEC 4000 series	?
DSOS	?	?	?	defunct	TI-980A minicomputer	?
DSP/BIOS	Free	closed, available with license	general purpose	maintenance only	Mostly Texas Instruments C2800, C5500, C6000 and OMAP DSP cores. Replaced by TI-RTOS, but available for download.	www.ti.com/tool/dspbios
DSPnano RTOS	Mixed, open source and commercial	open source	MCU, DSC, DSP SoC	active	R8C, M16C, PIC24, dsPIC33	www.rowebots.com/products/dspnano
DuinOS	Modified GNU GPL	open source	general purpose	active	AVR (Arduino)	code.google.com/p/duinos
eChronos	AGPLv3	open source	embedded	active	ARM Cortex-M3 - M7	https://web.archive.org/web/20190421081200/http://ts.data61.csiro.au/projects/TS/echronos/
eCos	Modified GNU GPL	open source	embedded	active	ARM-XScale-Cortex-M, CalmRISC, 680x0-ColdFire, fr30, FR-V, H8, IA-32, MIPS, MN10300, OpenRISC, PowerPC, SPARC, SuperH, V8xx	ecos.sourceware.org
eCosPro	Modified GNU GPL or eCosPro license	open source with non-free portions	embedded	active	ARM7-9, Cortex-A5-A9-M3-M4-M7, 680x0-ColdFire, H8-H8S, IA-32, MIPS32, MIPS64, microMIPS, NIOS II, OpenRISC, PowerPC, SPARC, SH4/4A, TILE-Gx, XScale	www.ecoscentric.com/ecos/ecospro.shtml
embOS	Proprietary	closed, available to customers, free object code for non-commercial use	embedded, industrial, IoT, safety critical	active	ARM7/9/11, ARM Cortex-A/R/M, AVR, AVR32, C16x, CR16C, ColdFire, H8, HCS12, M16C, M32C, MSP430, NIOS2, PIC18/24/32, R32C, R8C, RISC-V, RL78, RH850, RX100/200/600/700, RZ, SH2A, STM8, ST7, V850, 78K0, 8051	www.segger.com/embos.html
Embox	BSD	open source	embedded	active	ARM, LEON, MicroBlaze, MIPS, PowerPC, x86	github.com/embox/embox
Embkernel	GNU LGPL	open source	embedded	active	ARM Cortex M	sourceforge.net/p/embkernel
ERIKA Enterprise	GPL and GPL linking exception	open source	embedded	active	ARM7, ARM Cortex-M, ARM Cortex-A (on Jailhouse hypervisor), Hitachi H8, Altera Nios2, Microchip dsPIC (including dsPIC30, dsPIC33, and PIC24), Microchip PIC32, ST Microelectronics ST10, Infineon C167, Infineon Tricore, Freescale PPC e200 (MPC 56xx) (including PPC e200 z0, z6, z7), Freescale S12XS, EnSilica eSi-RISC, AVR, Lattice Mico32, MSP430, Renesas RX200, x86-64 (on Jailhouse hypervisor)	www.erika-enterprise.com
EUROS	Proprietary	closed	embedded	active	8/16/32 bit processors: among others AVR, 8051, XC800, 16FX, XC166, ARM, Cortex-M3, PowerPC, Nios II, MIPS32, PIC32	www.euros-embedded.com
EROS	Modified GNU GPL	open source	experimental research use	dormant	IA-32	www.eros-os.org
F9 microkernel	Modified BSD	open source	embedded	maintenance	ARM Cortex-M3/M4	github.com/f9micro/f9-kernel
Femto OS	GNU GPLv3	open source	embedded	active	AVR	www.femtoos.org
Flexible Safety RTOS	Proprietary	closed, available to customers	embedded, safety critical	active	ARM9, ARM Cortex-M, ARM Cortex-R, ARM Cortex-A, ColdFire, QorIQ, Infineon TriCore, Infineon AURIX	www.embedded-office.com
FlexOS	Proprietary	closed	general purpose, industrial, POS	defunct	186, 286, 386, V60, V70, 68000	Digital Research, Novell
FreeOSEK	GNU GPLv3	open source	embedded	active	Cortex-M4, MIPS, MSP430, SPARC LEON3	github.com/ciaa/Firmware
FreeRTOS	MIT	open source	embedded	active	ARM, AVR, AVR32, ColdFire, HCS12, IA-32, Cortex-M3-M4-M7, Infineon XMC4000, MicroBlaze, MSP430, PIC, PIC32, Renesas H8/S, RX100-200-600-700, 8052, STM32, TriCore, EFM32	www.freertos.org
Frosted	GNU GPL	open source	embedded, POSIX compliant, unix-like	active	ARM Cortex-M	github.com/insane-adding-machines/frosted
Fuchsia	Varies	open source	embedded	active	AArch64, x86-64	fuchsia.googlesource.com
FunkOS	modified Sleepycat License	open source	embedded	active	AVR, MSP430, Cortex-M3	funkos.sourceforge.net
Fusion RTOS	Free	?	semi-general purpose	active	ARM, Blackfin, StarCore, DSP 56800E
FX-RTOS	Proprietary	source code provided	embedded	active	ARMv6-M (Cortex-M0/M1), ARMv7-M (Cortex-M3), ARMv7-A (including Cortex A9 MPCore), x86, AVR32, PIC32, MIPS M4K, TI MSP430	rtos.eremex.com/products, fxrtos.ru
HeartOS	Proprietary	closed	safety critical	active	x86, PowerPC, ARM	www.ddci.com/products_heartos.php
Helium	GNU LGPL	open source	Embedded	Active	HCS08, AVR	helium.sourceforge.net
HP-1000/RTE	?	?	?	?	?	www.hp.com/products1/rte/tech_support/documentation
Hybridthreads	?	open source	FPGA	active	Xilinx Virtex-II Pro ML310, Xilinx Virtex-II Pro XUP	hthreads.csce.uark.edu/wiki/About_Hthreads
hyperCOS	?	free evaluation (not open source)	embedded	active	ARM7, ARM9, Cortex-R, Cortex-M3, Cortex-M4F	socware.net
IBM 4680 OS	Proprietary	closed	general purpose, industrial, POS	defunct	286	IBM (DR Concurrent DOS 286 derivative)
IBM 4690 OS	Proprietary	closed	general purpose, industrial, POS	active	286, 386	IBM (DR FlexOS 286/386 derivative)
Integrity	Proprietary	closed	embedded	active	ARM, XScale, Blackfin, ColdFire, MIPS, PowerPC, x86	www.ghs.com/products/rtos/integrity.html
INtime	Proprietary	closed	embedded	active	x86	www.tenasys.com/intime
IntrOS	MIT	open source	embedded, small footprint	active	ARM Cortex-M, STM8, AVR8	github.com/stateos/IntrOS
ITRON, µITRON	Varies	varies	embedded	active	ARM, MIPS, x86, Renesas RX100-200-600-700-others	www.tron.org, www.t-engine.org
ISIX	GNU LGPL	open source	embedded	active	Cortex-M3	bryndza.boff.pl/index.php?dz=rozne&id=isixrtos
iRTOS	GNU LGPL	open source	embedded	active	AVR, ARM7	irtos.sourceforge.net
KolibriOS	GNU GPL	open source	embeddable	active	x86	www.kolibrios.org
Kithara RTS	Proprietary	closed	general purpose, industrial	active	Windows extension, x86, x86-64, Windows XP-10	www.kithara.de
Lepton	Mozilla	open source	embeddable	active	ARM9 (ATMEL AT91SAM9261, AT91SAM9260), ARM7 (ATMEL AT91SAM7x, AT91SAM7SE, AT91M55800), CortexM3 (ST STM32F103, Texas Instrument Stellaris) et CortexM4 (Freescale Kinetis)	github.com/lepton-distribution/lepton
LithOS	Proprietary	?	embedded, industrial	active	LEON2-3-4, x86	www.fentiss.com, www.xtratum.org
LxWin	Proprietary	closed	MS Windows extension	active	x86	https://www.acontis.com/lxwin.html
LynxOS	Proprietary	source code available	embedded	active	Motorola 68010, x86/IA-32, ARM, Freescale PowerPC, PowerPC 970, LEON	www.lynuxworks.com/rtos
Maestro	Proprietary	closed	embedded	active	ARMv7-A, ARMv8-A, PowerPC64, IA-32	www.hipperos.com/maestro
Mark3	BSD	open source	embedded	active, beta	?	www.mark3os.com
MaRTE OS	GNU GPL	open source	embedded	active	IA-32	marte.unican.es
MAX II,IV	Proprietary	?	?	?	MODCOMP II, IV, ...	?
MenuetOS	GNU GPL	open source	?	active	IA-32	www.menuetos.net
Menuet 64	Proprietary	unknown	?	active	IA-32, x86-64	?
MicroC/OS-II	Proprietary	Available under license	embedded	active	ARM7-9-11/Cortex-M1-3-4-A8/9, AVR, HC11/12/S12, ColdFire, Blackfin, MicroBlaze, NIOS, 8051, x86, Win32, H8S, M16C, M32C, MIPS, 68000, PIC24-dsPIC33-PIC32, MSP430, PowerPC, SH, StarCore, Renesas RX100-200-600-700, RL; STM32, …	micrium.com/rtos/ucosii/overview
MicroC/OS-III	Proprietary	Available under license	embedded	active	ARM7-9-11/Cortex-M1-3-4-A8/9, AVR, HC11/12/S12, ColdFire, Blackfin, MicroBlaze, NIOS, 8051, x86, Win32, H8S, M16C, M32C, MIPS, 68000, PIC24/dsPIC33/PIC32, MSP430, PowerPC, SH, StarCore, Renesas RX100-200-600-700, RL; STM32, …	micrium.com/rtos/ucosiii/overview
Milos	GNU GPL	open source	embedded	active	Cortex-M3	www.milos.it
miosix	GNU GPL	open source	embedded	active	stm32, efm32 e LPC2000	www.miosix.org
mipOS	Proprietary	open source	embedded	active	Cortex-M3, ST7, STM8, x86	sites.google.com/site/eantcal/home/mipos
Microsoft Invisible Computing (MMLite)	Proprietary	open source	embedded	active	ARM7-9, i386, h8, mips, Trimedia, eCog1	research.microsoft.com/invisible
mLithOS	Proprietary	?	embedded, industrial	active	LEON2-3-4, x86	www.fentiss.com, www.xtratum.org
MP/M	Proprietary	closed (meanwhile: open source)	general purpose, industrial	defunct	8080, Z80, 8086	Digital Research
MQX	Proprietary	complimentary source code available	embedded	active	Freescale Power, ColdFire, Kinetis Cortex ARM, List of Freescale products	www.freescale.com/mqx
MERT	?	?	?	inactive	PDP-11	?
Multiuser DOS	Proprietary	closed	general-purpose, industrial	defunct	386	Digital Research/Novell, Concurrent Controls, Datapac, IMS (see REAL/32)
Nano-RK	Mixed	open source	embedded, WSN	active	AVR, MSP430	www.nanork.org
Neutrino	Proprietary	some source code provided	microkernel	active	ARM, MIPS, PPC, SH, x86, XScale	www.qnx.com/products/neutrino_rtos
NI Linux Real-Time	Proprietary	developed from open source	data acquisition and process control	active	National Instruments CompactRIO controllers	www.ni.com/white-paper/14627/en/
nOS	Mozilla	open source	embedded	active	AVR, MSP430, Cortex-M0-M3-M4, M16C, RX600, PIC24, Win32, POSIX, STM8	github.com/jimtremblay/nOS
Nucleus RTOS	Proprietary	source code provided	embedded	active	ARM (Cortex-M3-M4-R4-R4F-A8-A9, ARM7-9-11), PowerPC, MIPS32-16e, microMIPS, ColdFire, SuperH	www.mentor.com/embedded-software/nucleus
NUFR	Modified BSD	open source	embedded	active	ARM (Cortex-M0,-M3,-M4), MSP430, MSP430X (16- and 20-bit models)	ragingdist.org
Nut/OS	BSD	open source	embedded, industrial	active	AVR, AVR32, ARM7, ARM9, Cortex-M3	www.ethernut.de/en/firmware/nutos.html
NuttX	BSD	open source	embedded, small footprint	active	Linux user mode, ARM7-9, Cortex-A5-A8-A9-M0-M3-M4-M7, 8052, Espressif ESP32, Lattice LM32, Renesas MC16C/26/SH-1, RISC-V , Zilog Z16F, Zilog eZ80 Acclaim!, Zilog Z8Encore!, Z80, MIPS PIC32MX, PIC32MZ	www.nuttx.org
OpenEPOS	Proprietary	open source	embedded	active	ARM, x86, AVR, MIPS, PowerPC	epos.lisha.ufsc.br
OS20	Proprietary	closed	embedded (STB)	maintenance only	ST20	?
OS2000	Proprietary	?	embedded	active	MIPS (Baget-MIPS variant), KOMDIV-32, KOMDIV-64, Intel BSPs (x86 architecture)	www.niisi.ru/otd07.htm
OS21	Proprietary	source code provided	embedded (STB)	active	ST40/SH4,ST200,ARM	?
OS4000	Proprietary	closed	process control	maintenance only	GEC 4000 series	?
OpenRTOS	Proprietary	source code available	embedded	active	Same as FreeRTOS	www.highintegritysystems.com/rtos/openrtos
OSA	BSD	open source	embedded	active	PIC10-PIC24, AVR 8-bit, STM8	wiki.pic24.ru/doku.php/en/osa/ref/intro
OSE	Proprietary	available to customers	general purpose	active	ARM, PowerPC, x86, TI OMAP, …	www.enea.com/ose
OS-9	Proprietary	available to customers	embedded	active	ARM-strongARM, MIPS, PowerPC, SuperH, x86/Pentium, XSCALE, Motorola 6809, 680x0, SPARC	www.microware.com
OSEK	Mixed, open source and commercial	specification	embedded	active	engine control units	www.osek-vdx.org (not working for a while), better refer to www.autosar.org
Partikle	Proprietary	?	embedded, industrial	active	LEON2-3-4, x86	www.fentiss.com, www.xtratum.org
Phar Lap ETS	?	?	?	?	?	?
PaulOS	GNU GPL	open source	embedded	?	?	paulos.2038bug.com
PICOS18	GNU GPL	open source	embedded	?	PIC18	?
picoOS	Modified BSD	open source	embedded	maintenance	6502, 80x86, ARM7, AVR, PowerPC,Cortex-M,MSP430,PIC32	picoos.sourceforge.net,github.com/AriZuu/picoos
Piko/RT	Modified BSD	open source	embedded	active	ARM Cortex-M3/M4	github.com/pikort/pikoRT
Pharos	Apache 2.0	open source	embedded, industrial, safety critical	active	ARM (ARM926, Cortex-R5, Cortex-M4, Cortex-A53 - 64 bits), RISC-V (64 bits) (all with memory protection)	sourceforge.net/projects/rtospharos/
Phoenix-RTOS	Proprietary	?	embedded	?	ARM7, IA-32, eSI-RISC	www.phoenix-rtos.org
PikeOS	Proprietary	available to customers	certifiable safety & security, embedded virtualisation	active	PPC, x86, ARM, MIPS, SPARC-LEON,	www.sysgo.com/pikeos
Portos	Proprietary	source code provided	embedded, small footprint	active	(ARM soon)	www.portos.org
POK	BSD	open source	embedded	active	x86, PowerPC, SPARC	pok-kernel.github.io
PowerTV	Proprietary	?	?	?	?	www.powertv.com
Prex	BSD	open source	microkernel	active	ARM, IA-32	prex.sourceforge.net
Protothreads	BSD	open source	general purpose	active	Architecture independent	dunkels.com/adam/pt/
pSOS	Proprietary	?	?	discontinued	680x0	?
QNX	Proprietary	?	general purpose, medical devices	active	IA-32, MIPS, PowerPC, SH-4, ARM, StrongARM, XScale	www.qnx.com
QP	Dual, open source and commercial	dual	MCU, DSC, DSP SoC	active	ARM7/9, ARM Cortex-M3-M0, MSP430, TMS320C28x, AVR, AVRXmega, ColdFire, 68HC08, M16C/R8C, H8, 8051, 80251, PIC18, PIC24/dsPIC33, Nios II, PSoC1	www.state-machine.com/qp
Quest	Apache 2.0	open source	embedded / mixed-criticality	active	x86	www.questos.org
Kaspersky OS	Proprietary	?	safety critical, virtualization	active	?	?
Data General RDOS	Proprietary	?	general purpose	defunct	Data General Nova, Data General Eclipse	?
ReaGOS	Proprietary	closed, available with license	embedded	active	x86, ATmega, ARM, portable	www.reagos.com
REAL/32	Proprietary	closed	general-purpose, industrial	active	386	IMS (Multiuser DOS derivative)
RedHawk Linux (RHEL, CentOS; Ubuntu compatible)	Proprietary	closed, available with license	Hard Real-Time: server, workstation; embedded	active	x86, ARM	www.concurrent-rt.com/products/redhawk-linux
Real-time Linux (CONFIG_RT_PREEMPT)	GNU GPLv2	open source	general purpose	active	same as Linux	www.osadl.org/Realtime-Linux.projects-realtime-linux.0.html, rt.wiki.kernel.org, wiki.linuxfoundation.org/realtime/start
REX OS	Proprietary	closed, available with license	embedded	inactive	ARM	ja:REX OS
RIOT	GNU LGPL	open source	embedded	active	ARM, MSP430, AVR, x86	www.riot-os.org
RMX	Proprietary	closed	embedded	defunct	8080, 8086, 80386 or higher	www.tenasys.com/rmx
RODOS	BSD	source code provided	embedded	active	ARMv7 (M3, A8, A9), AVR32, PowerPC 405, sparc64 Platforms: SmartFusion2, RaspberryPi, STM32 On top of OS: Linux, Windows, MacOS, FreeRTOS, RTems	rodos download
RSX-11	Proprietary	?	?	historic	PDP-11	n/a
RT-11	Proprietary	?	general purpose	defunct	PDP-11	n/a
RTAI	GNU GPL	open source	general purpose	active	x86, ARM	www.rtai.org
RTEMS	modified GNU GPL	open source	embedded	active	ARM, Blackfin, ColdFire, TI C3x/C4x, H8/300, x86, 68k, Milkymist SoC, MIPS, Nios II, PowerPC, SuperH, SPARC, ERC32, LEON, Mongoose-V	rtems.com
RTLinux	GNU GPL	open source	general purpose	inactive	same as Linux	n/a
RT-Thread	Apache 2.0	open source	embedded	active	ARM, ARM Cortex-M0-M3-R4-M4-M7, IA-32, AVR32, Blackfin, nios, PPC, M16C, MIPS (loongson-1b-1c, PIC32，xburst), MicroBlaze, V850, unicore32,	code.google.com/p/rt-thread, www.rt-thread.org
RTXC Quadros	Proprietary	source available	embedded	active	ARM - Atmel/Freescale/NXP/ST/TI, Blackfin, 680x0-ColdFire, PowerPC, StarCore, TI-Luminary Stellaris, TI OMAP, XScale	www.quadros.com/products/operating-systems
RTX, RTX64	Proprietary	closed	MS Windows extension	active	x86, x86-64	www.intervalzero.com/rtx.htm
RTX Keil Real-Time Operating System	Proprietary, royalty free	source available	embedded	active	ARM	www.keil.com/arm/rl-arm/kernel.asp
Ruff	Proprietary	closed	embedded,general purpose, industrial, IoT	active	ARM, MIPS, x86	ruff.io/docs/faq.html
RX116	?	?	embedded, industrial	defunct	NEC V20, NEC V30, NEC V40, NEC V50	first ITRON 1 compatible 16-bit RTOS
RX616	?	?	safety critical, embedded, industrial	defunct	NEC V60, NEC V70	32-bit ITRON compatible
RX-UX832	?	?	embedded, industrial, general-purpose	defunct	NEC V60, NEC V70	32-bit Unix-like RTOS
SafeRTOS	Proprietary	source code & Design Assurance Pack available	embedded, safety critical	active	Same as FreeRTOS	Same as FreeRTOS
SCIOPTA	Proprietary	closed, source available	embedded, safety related	active	ARM, Cortex-M0-M3-M4, Cortex-R4, Cortex-A5, Cortex-A7, Cortex-A9, Cortex-A53, XScale, Renesas RX100, RX200, RX600, RX700, PowerPC, ColdFire, HCS12, M16C, Windows (simulation), Aurix TC2xx, BlackFin BF52x, BF70x	www.sciopta.com
scmRTOS	Free	open source	embedded	active	ARM, Cortex-M3, Blackfin, MSP430, AVR, STM8	scmrtos.sourceforge.net
SDPOS	GNU LGPL	open source	embedded	active	ARM, Cortex-M3, Blackfin, PIC18, PIC24, i386 win32/linux synthetic targets	www.sdpos.org
SHaRK	GNU GPL	open source	?	inactive	?	shark.sssup.it
silRTOS	Free	open source	embedded	active	ARM, Cortex-M3 Cortex-A9 ARM-11MP, Blackfin, MIPS, AVR	spanidea.com/products.php
Simba	MIT	open source	embedded	active, beta	Arduino Nano (AVR), Arduino Mega (AVR), Arduino Due (ARM), ESP8266, ESP32, cygwin/linux	simba-os.readthedocs.org/en/latest
SimpleAVROS	GNU GPLv3	open source	embedded	active, beta	AVR only	n/a
SINTRAN III	?	?	?	?	Norsk Data computers	n/a
SOOS Project	Free	open source	embedded	active, beta	H8/300	www.ingelec.uns.edu.ar/rts/soos
StateOS	MIT	open source	embedded, small footprint	active	ARM Cortex-M, STM8	github.com/stateos/StateOS
Stratify OS	Modified GNU GPL or proprietary	open source	embedded	active	ARM Cortex-M3, M4	stratifylabs.co/Stratify-OS/
Symbian OS	Eclipse	open source	embedded	defunct	ARM	www.symbian.org
Talon DSP RTOS	Proprietary	?	embedded DSP	active	TMS320	www.blackhawk-dsp.com/Talon.aspx
TargetOS	Proprietary	available to customers	embedded	active	ARM, Cortus, Freescale ColdFire, PowerPC	www.blunkmicro.com/os.htm
T-Kernel	T-License	source available	embedded RTOS	active	ARM, MIPS, SH, more	www.t-engine.org
THEOS	?	?	?	?	?	www.theos-software.com
ThreadX	Proprietary	available to customers	?	active	ARC, ARM/Thumb, AVR32, BlackFin, 680x0-ColdFire, H8-300H, Luminary Micro Stellaris, M-CORE, MicroBlaze, PIC24-dsPIC, PIC32, MIPS, V8xx, Nios II, PowerPC, Renesas RX100, RX200, RX600, RX700, Synergy, SH, SHARC, StarCore, STM32, StrongARM, TMS320C54x, TMS320C6x, x86/x386, XScale, Xtensa/Diamond, ZSP	rtos.com/solutions/threadx/
TizenRT	Apache 2.0	open source	embedded	active	ARM	github.com/Samsung/TizenRT
TI-RTOS Kernel (SYS/BIOS)	BSD	open source	embedded	active	Mostly Texas Instruments: MSP430-432, C2000-5000-6000, TI's ARM families (Cortex M3-4F-R4-A8-A15), SimpleLink Wireless CC2xxx-CC3xxx	www.ti.com/tool/sysbios
Tock OS	Apache 2.0/MIT	open source	embedded	active	ARM Cortex	https://web.archive.org/web/20190710014852/https://www.tockos.org/
Trampoline Operating System (OSEK and AUTOSAR)	GNU GPLv2	open source	embedded	active	AVR, H8-300H, POSIX, NEC V850e, ARM7, Infineon C166, HCS12 or PowerPC	trampoline.rts-software.org
TNKernel	BSD	open source	embedded	active	ARM, PIC24-32-dsPIC, HCS08, STM32 (Cortex-M3)	www.tnkernel.com
TNeo	BSD	open source	embedded	active	Cortex-M0-M0+-M1-M3-M4-M4F, PIC24-32-dsPIC	github.com/dimonomid/tneo
Transaction Processing Facility	Proprietary	?	general purpose	active	IBM System/360 derivatives	www.ibm.com/software/htp/tpf
TRON project	Free	mixed	mixed	active	any: is a specification, not an implementation	www.tron.org/index-e.html
TUD:OS	GNU GPL	open source	?	active	ARM, IA-32, x86-64	demo.tudos.org/eng_about.html
Unison RTOS	Mixed, open source and commercial	open source	MCU, DSC, DSP SoC, FPGA	active	Pic32, ARM Cortex (TI Stellaris Tiva Sitara, ST STM32, NXP LPC1X00, Freescale iMX6 Kinetis, Renesas RZ, RX600, SH2A, SH2AFPU, R32C, MIPS4K, {SHARC, ColdFire, Xilinx MicroBlaze, proprietary}	www.rowebots.com/en/products/unison-rtos-article
UNIX-RTR	?	?	?	defunct	PDP-11	?
uSmartx	BSD	open source	embedded	?	ARM7TDMI, AVR, H8	usmartx.sourceforge.net
u-velOSity	Proprietary	?	microkernel	active	?	www.ghs.com/products/micro_velosity.html
velOSity	?	?	?	active	Power ISA, ARM/XScale, MIPS, x86/Pentium, ColdFire, Blackfin, OMAP, DaVinci	www.ghs.com/products/velosity.html
VRTX	Proprietary	?	?	superseded by Nucleus RTOS	ARM, MIPS, PowerPC, RISC	www.mentor.com/embedded-software/nucleus
VxWorks	Proprietary	?	embedded	active	ARM, IA-32, Intel 64, MIPS, PowerPC, SH-4, StrongARM, xScale	www.windriver.com/products/vxworks
Windows CE	Proprietary	Microsoft Shared Source	embedded	active	x86, MIPS, ARM, SuperH	www.microsoft.com/windowsembedded
Xenomai	GNU GPLv2	open source	general	active	x86, x86-64, PowerPC, ARM, Analog Devices Blackfin BF52x, BF53x, BF54x and BF56x	www.xenomai.org
XMK	BSD	open source	embedded	inactive-beta	?	www.integerfox.com/xmk
Simulink Real-Time	Proprietary	closed	real-time testing-embedded	active	x86	www.mathworks.com/products/simulink-real-time
Y@SOS	GNU LGPL	open source	embedded	active	Cortex-M3, STM32	www.yasos.org
MontaVista Linux	GNU GPL	open source	embedded	active	?	www.mvista.com
UNOS	?	?	?	historic	680x0	?
uOS	GNU GPL	open source	embedded	active	AVR, ARM, MIPS32, MSP430, Intel i386, Linux386	code.google.com/p/uos-embedded/wiki/about
Huawei LiteOS	BSD	open source	embedded	active	ARM (M0/3/4/7, A7/17/53, ARM9/11), X86,RISC-V	www.huawei.com/minisite/liteos/en/about.html
Zephyr	Apache 2.0	open source	embedded	active	ARM (Cortex-M0, Cortex-M3, Cortex-M4, Cortex-M23, Cortex-M33), x86, ARC, RISC-V, Nios II, Xtensa	www.zephyrproject.org

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