Comparison of real-time operating systems

Summary

This is a list of real-time operating systems (RTOSs). This is an operating system in which the time taken to process an input stimulus is less than the time lapsed until the next input stimulus of the same type.


Name License Source model Target uses Status Platforms Official website
Abassi Proprietary closed embedded active AVR32, ATmega, ColdFire, Cortex-A53, Cortex-A9, -M0, -M3, -M4, MSP430, PIC32, TMS320C2000, 80251, 8051 www.code-time.com/products.html
Amos Proprietary ? commercial closed 680x0, 683xx, x86 via emulation www.alphamicro.com
AdAstra-RTK BSD 3-clause open source embedded active Cortex-M3-M4-M7-H7, STM32 adastra-soft.com
AMX -RTOS Proprietary closed 680x0, 683xx, ARM, ColdFire, MIPS32, PowerPC, x86 www.kadak.com/rtos/rtos.htm
Apache Mynewt Apache 2.0 open source ARM Cortex-M, MIPS32, Microchip PIC32, RISC-V mynewt.apache.org
Arm OS Apache 2.0 Cortex-M, Cortex-R, Cortex-A os.mbed.com
uKOS GNU GPL Cortex-M3-M4-M7-H7, 6833x, PIC, CSEM icyflex-1, STM32 www.ukos.ch
ARTOS (Locamation) Proprietary closed power-system automation x86 www.locamation.com
ARTCOS (Robotu) Proprietary ? embedded, robots defunct ARM9+ www.robotu.com/ARTOS/Welcome.html
Atomosher BSD open source embedded active AVR, STM8, ARM, MIPS atomthreads.com
AVIX Proprietary closed 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 archived ARM, Cortex-M3, ARM ARM7TDMI, Atmel AVR, PowerPC (emu), x86 (emu), x86-64 (emu) www.bertos.org
BOOS-Mooch Core GNU GPL active ARMv5TEJ (TI AM18x), DSP (TI TMS320C64x) www.baigudin.software/boos
BRKos MIT Freescale Kinetis (ARM Cortex-M4), NXP 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 IA-32, ARM9 www.capros.org
Cesium RTOS Proprietary source available to licensees active ARM7-9-11/Cortex-M1-3-4-7-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 www.weston-embedded.com/products/cesium
ChibiOS/RT Mixed, GNU GPL or proprietary open source embedded, small footprint 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 embedded discontinued ARM Cortex-M3, LPC17xx www.coactionos.com
cocoOS BSD 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 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 inactive 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 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 ?
Drone OS Apache 2.0/MIT open source embedded active ARMv7-M, ARMv8-M, RISC-V https://www.drone-os.com/
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 AVR (Arduino) code.google.com/p/duinos
eChronos CSIRO BSD MIT open source embedded ARM Cortex-M3 - M7 https://ts.data61.csiro.au/projects/TS/echronos/
eCos Modified GNU GPL open source 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 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 ARM, LEON, MicroBlaze, MIPS, PowerPC, x86 github.com/embox/embox
Embkernel GNU LGPL ARM Cortex M sourceforge.net/p/embkernel
ERIKA Enterprise GPL and GPL linking exception 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 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 embedded maintenance ARM Cortex-M3/M4 github.com/f9micro/f9-kernel
Femto OS GNU GPLv3 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 ARM, AVR, AVR32, ColdFire, ESP32, HCS12, IA-32, Cortex-M3-M4-M7, Infineon XMC4000, MicroBlaze, MSP430, PIC, PIC32, Renesas H8/S, RISC-V, RX100-200-600-700, 8052, STM32, TriCore, EFM32 www.freertos.org
Frosted GNU GPL embedded, POSIX compliant, unix-like ARM Cortex-M https://gitlab.com/insane-adding-machines/frosted
Fuchsia Varies embedded AArch64, x86-64 fuchsia.dev
FunkOS modified Sleepycat License embedded AVR, MSP430, Cortex-M3 funkos.sourceforge.net
Fusion RTOS Free ? semi-general purpose ARM, Blackfin, StarCore, DSP 56800E
FX-RTOS Proprietary source code provided embedded 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 x86, PowerPC, ARM www.ddci.com/products_heartos.php
Helium GNU LGPL open source Embedded 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 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 active 286, 386 IBM (DR FlexOS 286/386 derivative)
INTEGRITY Proprietary embedded ARM, XScale, Blackfin, ColdFire, MIPS, PowerPC, x86 www.ghs.com/products/rtos/integrity.html
INtime Proprietary x86 www.tenasys.com/intime
IntrOS MIT open source embedded, small footprint ARM Cortex-M, STM8, AVR8 github.com/stateos/IntrOS
ITRON T-License varies embedded ARM, MIPS, x86, Renesas RX100-200-600-700-others www.tron.org
ISIX GNU LGPL open source Cortex-M3 bryndza.boff.pl/index.php?dz=rozne&id=isixrtos
iRTOS GNU LGPL AVR, ARM7 irtos.sourceforge.net
KolibriOS GNU GPL embeddable active x86 www.kolibrios.org
Kithara RTS Proprietary closed general purpose, industrial Windows extension, x86, x86-64, Windows XP-10 www.kithara.de
Lepton Mozilla open source embeddable 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 LEON2-3-4, x86 www.fentiss.com, www.xtratum.org
LxWin Proprietary closed MS Windows extension x86 https://www.acontis.com/lxwin.html
LynxOS Proprietary source code available embedded Motorola 68010, x86/IA-32, ARM, Freescale PowerPC, PowerPC 970, LEON www.lynx.com/products/lynxos-178-do-178c-certified-posix-rtos
Maestro Proprietary closed ARMv7-A, ARMv8-A, PowerPC64, IA-32 www.hipperos.com/maestro
Mark3 BSD open source active, beta ? www.mark3os.com
MaRTE OS GNU GPL 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 ? IA-32, x86-64 ?
MicroC/OS-III Apache 2.0 open source embedded 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/kernels
Milos GNU GPL Cortex-M3 www.milos.it
miosix GNU GPL stm32, efm32 e LPC2000 www.miosix.org
mipOS Proprietary Cortex-M3, ST7, STM8, x86 www.eantcal.eu/home/mipos
Microsoft Invisible Computing (MMLite) Proprietary ARM7-9, i386, h8, mips, Trimedia, eCog1 research.microsoft.com/invisible
mLithOS Proprietary ? embedded, industrial LEON2-3-4, x86 www.fentiss.com, www.xtratum.org
MOTORCORTEX Proprietary server: closed, clients: open source x86, ARM motorcortex.io, www.vectioneer.com
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 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 National Instruments CompactRIO controllers www.ni.com/white-paper/14627/en
nOS Mozilla open source embedded AVR, MSP430, Cortex-M0-M3-M4, M16C, RX600, PIC24, Win32, POSIX, STM8 github.com/jimtremblay/nOS
Nucleus RTOS Proprietary source code provided 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 ARM (Cortex-M0,-M3,-M4), MSP430, MSP430X (16- and 20-bit models) ragingdist.org
Nut/OS BSD open source embedded, industrial AVR, AVR32, ARM7, ARM9, Cortex-M3 www.ethernut.de/en/firmware/nutos.html
NuttX Apache 2.0 open source embedded, small footprint 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 nuttx.apache.org
OpenEPOS Proprietary open source embedded 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) 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 PIC10-PIC24, AVR 8-bit, STM8 wiki.pic24.ru/doku.php/en/osa/ref/intro
OSE Proprietary available to customers general purpose ARM, PowerPC, x86, TI OMAP, … www.enea.com/ose
OS-9 Proprietary available to customers embedded ARM-strongARM, MIPS, PowerPC, SuperH, x86/Pentium, XSCALE, Motorola 6809, 680x0, SPARC www.microware.com
OSEK Mixed, open source and commercial specification engine control units Various (mostly Automotive) vendors implemented and distribute/sell OSEK
Partikle Proprietary ? embedded, industrial 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 ? PIC18 ?
picoOS Modified BSD open source maintenance 6502, 80x86, ARM7, AVR, PowerPC, Cortex-M, MSP430, PIC32 picoos.sourceforge.net,github.com/AriZuu/picoos
Piko/RT Modified BSD open source active ARM Cortex-M3/M4 github.com/pikort/pikoRT
Pharos Apache 2.0 open source embedded, industrial, safety critical ARM (ARM926, Cortex-R5, Cortex-M4, Cortex-A53 - 64 bits), RISC-V (64 bits) (all with memory protection) sourceforge.net/projects/rtospharos
Phoenix-RTOS BSD open source embedded ARMv7 Cortex-M, ARMv7 Cortex-A, IA-32, RISC V www.phoenix-rtos.com
PikeOS Proprietary available to customers certifiable safety & security, embedded virtualisation PPC, x86, ARM, MIPS, SPARC-LEON, www.sysgo.com/pikeos
Portos Proprietary source code provided embedded, small footprint (ARM soon) www.portos.org
POK BSD open source embedded 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 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 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 x86 www.questos.org
Kaspersky OS Proprietary ? safety critical, virtualization ? ?
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 386 IMS (Multiuser DOS derivative)
RedHawk Linux (RHEL, CentOS; Ubuntu compatible) Proprietary closed, available with license Hard Real-Time: server, workstation; embedded x86, ARM www.concurrent-rt.com/products/redhawk-linux
Real-time Linux (CONFIG_RT_PREEMPT) GNU GPLv2 open source general purpose 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 active ARM, MSP430, AVR, x86, RISC-V www.riot-os.org
RMX Proprietary closed defunct 8080, 8086, 80386 or higher www.tenasys.com/rmx
RODOS BSD source code provided 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 (with and without FPU and TSC), x86-64, PowerPC, ARM (StrongARM; ARM7: clps711x-family, Cirrus Logic EP7xxx, CS89712, PXA25x), m68k (supporting both MMU and NOMMU cpus) www.rtai.org
RTEMS modified GNU GPL embedded 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 general purpose inactive same as Linux Official vendor Wind River Linux
RTOS-UH[1] Proprietary ? embedded ? 68k, 683xx, PowerPC, MPC5xx www.rtos-uh.de
RTOS-32 Proprietary, royalty free source available embedded active x86 www.on-time.com
RT-Thread Apache 2.0 open source embedded 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 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 x86, x86-64 RTX64 RTOS, Real-Time Solutions for Windows 10 IoT (intervalzero.com)
RTX Keil Apache 2.0 open source embedded ARM
  • https://www2.keil.com/mdk5/cmsis
  • http://arm-software.github.io/CMSIS_5/RTOS2/html/rtx5_impl.html
  • https://arm-software.github.io/CMSIS_5/RTOS2/html/functionOverview.html
  • http://arm-software.github.io/CMSIS_5/RTOS2/html/index.html
Ruff Proprietary closed embedded, general purpose, industrial, IoT 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 NEC V60, NEC V70 32-bit ITRON compatible
RX-UX832 ? ? embedded, industrial, general-purpose 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 ARM, Cortex-M0-M3-M4, Cortex-R4, -A5, -A7, -A9, -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 ARM, Cortex-M3, Blackfin, MSP430, AVR, STM8 scmrtos.sourceforge.net
SDPOS GNU LGPL embedded ARM, Cortex-M3, Blackfin, PIC18, PIC24, i386 win32/linux synthetic targets www.sdpos.org
SHaRK GNU GPL ? inactive ? shark.sssup.it
silRTOS Free embedded active ARM, Cortex-M3 -A9 -11MP, Blackfin, MIPS, AVR spanidea.com/products.php
Simba MIT active, beta Arduino Nano (AVR), Arduino Mega (AVR), Arduino Due (ARM), ESP8266, ESP32, cygwin/linux simba-os.readthedocs.org/en/latest
SimpleAVROS GNU GPLv3 AVR ATmega48 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 embedded, small footprint active ARM Cortex-M, STM8 github.com/stateos/StateOS
Stratify OS Modified GNU GPL or proprietary embedded ARM Cortex-M3, M4 stratifylabs.co/Stratify-OS
Symbian OS Eclipse 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 ARM, Cortus, NXP ColdFire, PowerPC www.blunkmicro.com/os.htm
T-Kernel T-License source available embedded RTOS ARM, MIPS, SH, more www.tron.org
THEOS ? ? ? ? ? www.theos-software.com
ThreadX Proprietary partial source available ? 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 azure.microsoft.com/en-us/services/rtos
TizenRT Apache 2.0 open source embedded ARM github.com/Samsung/TizenRT
TI-RTOS Kernel (SYS/BIOS) BSD open source 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 ARM Cortex, RISC-V https://www.tockos.org
Trampoline Operating System (OSEK and AUTOSAR) GNU GPLv2 open source embedded active Arduino Uno (AVR - ATMega), Arduino Mega (AVR - ATMega), XPlainedPro (Cortex-M0+), Raspberry Pi 2 Model B (Cortex-A7), Olimex LPC-L2294-1MB (ARM7 - NXP LPC2294), Teensy31 (Cortex-M4), XPC56XX EVB + XPC56XL MINI-MODULE (PowerPC - MPC564xL), ZedBoard (RISC-V - PULPino), STM32F4DISCOVERY (Cortex-M4 - STM32F40x), Nucleo-32 (Cortex-M4 - STM32F30x), Cortex-M3 - SmartFusion2, virt-V7 (builds a firmware with TrampolineRTOS that can be used as a guest on the hypervisor XVisor) github.com/TrampolineRTOS/trampoline
TNKernel BSD open source ARM, PIC24-32-dsPIC, HCS08, STM32 (Cortex-M3) www.tnkernel.com
TNeo BSD Cortex-M0-M0+-M1-M3-M4-M4F, PIC24-32-dsPIC github.com/dimonomid/tneo
Transaction Processing Facility Proprietary mixed general purpose IBM Z series www.ibm.com/products/z-transaction-processing-facility
TRON project Free mixed mixed active any: is a specification, not an implementation www.tron.org
TUD:OS GNU GPL open source ? ARM, IA-32, x86-64 demo.tudos.org github.com/TUD-OS
Ultibo Core GNU GPL open source Embedded unikernel Raspberry Pi including the A, B, A+ and B+ as well as the Raspberry Pi 2B, 3B, 4B/400/CM4 and Zero. www.ultibo.org
Unison RTOS Mixed, open source and commercial open source MCU, DSC, DSP SoC, FPGA 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
µITRON T-License open source embedded active ARM, MIPS, x86, Renesas RX100-200-600-700-others www.tron.org
u-velOSity Proprietary ? microkernel active ? www.ghs.com/products/micro_velosity.html
velOSity ? ? ? Power ISA, ARM/XScale, MIPS, x86/Pentium, ColdFire, Blackfin, OMAP, DaVinci www.ghs.com/products/velosity.html
VAXELN Proprietary closed source ? historic VAX en.wikipedia.org/wiki/VAXELN
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 x86, MIPS, ARM, SuperH www.microsoft.com/windowsembedded
Windows 10 IoT Proprietary ? Intel Atom, Celeron and Pentium, Qualcomm Snapdragon, Broadcom, NXP i.MX www.microsoft.com/en-us/windowsforbusiness/windows-iot
[2][3]
Xenomai GNU GPLv2 open source general x86, x86-64, PowerPC, ARM, Analog Devices Blackfin BF52x, BF53x, BF54x and BF56x www.xenomai.org
XINU Free embedded active x86, MIPS, ARM, AVR xinu.cs.purdue.edu
XMK BSD 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 Cortex-M3, STM32 www.yasos.org
MontaVista Linux GNU GPL ? 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 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 ARM (Cortex-M0, -M3, -M4, -M23, -M33, -R4, -R5, -A53), x86, x86-64, ARC, RISC-V, Nios II, Xtensa, SPARC www.zephyrproject.org

References

  1. ^ "Climbing and Walking Robots and the Support Technologies for Mobile Machines" 2002. p. 157. quote: "Real-Time Operating System - Universität Hannover"
  2. ^ "Windows Processor Requirements". docs.microsoft.com.
  3. ^ "Windows for Internet of Things (IoT) Platforms & Applications". Microsoft Windows for Business.

External links

  • Comparison of real-time operating systems at Curlie