Comparison of real-time operating systems
This is a list of real-time operating systems. An RTOS 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, Cortex-M0, Cortex-M3, Cortex-M4, MSP430, PIC32, TMS320C2000, 80251, 8051 | www |
| Amos | Proprietary | ? | commercial | closed | 680x0, 683xx, x86 via emulation | www |
| AdAstra-RTK | BSD 3-clause | open source | embedded | active | Cortex-M3-M4-M7-H7, STM32 | adastra-soft |
| AMX -RTOS | Proprietary | closed | 680x0, 683xx, ARM, ColdFire, MIPS32, PowerPC, x86 | www | ||
| Apache Mynewt | Apache 2.0 | open source | ARM Cortex-M, MIPS32, Microchip PIC32, RISC-V | mynewt | ||
| Arm OS | Apache 2.0 | Cortex-M, Cortex-R, Cortex-A | os | |||
| uKOS | GNU GPL | Cortex-M3-M4-M7-H7, 6833x, PIC, CSEM icyflex-1, STM32 | www | |||
| ARTOS (Locamation) | Proprietary | closed | power-system automation | x86 | www | |
| ARTCOS (Robotu) | Proprietary | ? | embedded, robots | defunct | ARM9+ | www |
| Atomosher | BSD | open source | embedded | active | AVR, STM8, ARM, MIPS | atomthreads |
| 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 | ||
| BeRTOS | modified GNU GPL | open source | archived | ARM, Cortex-M3, ARM ARM7TDMI, Atmel AVR, PowerPC (emu), x86 (emu), x86-64 (emu) | www | |
| BOOS-Mooch Core | GNU GPL | active | ARMv5TEJ (TI AM18x), DSP (TI TMS320C64x) | www | ||
| BRKos | MIT | 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 | |||
| CapROS | GNU GPL | IA-32, ARM9 | www | |||
| 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 | |
| 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 | |
| ChorusOS | ? | ? | ? | defunct | SPARC, x86, PowerPC | docs |
| ChronOS | GNU GPL | open source | research, general purpose | active | x86, ARM | chronoslinux |
| CoActionOS (now Stratify OS) | Modified GNU GPL or proprietary | embedded | discontinued | ARM Cortex-M3, LPC17xx | www | |
| cocoOS | BSD | active | AVR, MSP430, STM32 | www | ||
| 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 |
| 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 |
| Deos | Proprietary | closed | safety critical | active | x86, PowerPC, MIPS | www |
| DioneOS | Proprietary | available for licensee | embedded | MSP430, MSP430x | www | |
| 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 |
| 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 |
| 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 |
| DSPnano RTOS | Mixed, open source and commercial | open source | MCU, DSC, DSP SoC | active | R8C, M16C, PIC24, dsPIC33 | www |
| DuinOS | Modified GNU GPL | open source | general purpose | AVR (Arduino) | code | |
| 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 | ||
| 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 | ||
| 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 |
| Embox | BSD | open source | embedded | ARM, LEON, MicroBlaze, MIPS, PowerPC, x86 | github | |
| Embkernel | GNU LGPL | ARM Cortex M | sourceforge | |||
| 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 | |||
| EUROS | Proprietary | closed | 8/16/32 bit processors: among others AVR, 8051, XC800, 16FX, XC166, ARM, Cortex-M3, PowerPC, Nios II, MIPS32, PIC32 | www | ||
| EROS | Modified GNU GPL | open source | experimental research use | dormant | IA-32 | www |
| F9 microkernel | Modified BSD | embedded | maintenance | ARM Cortex-M3/M4 | github | |
| Femto OS | GNU GPLv3 | embedded | active | AVR | www | |
| 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 |
| 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 |
| 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 | |||
| 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 | ||
| 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 | |
| HeartOS | Proprietary | closed | safety critical | x86, PowerPC, ARM | www | |
| Helium | GNU LGPL | open source | Embedded | HCS08, AVR | helium | |
| HP-1000/RTE | ? | ? | ? | ? | ? | www |
| Hybridthreads | ? | open source | FPGA | active | Xilinx Virtex-II Pro ML310, Xilinx Virtex-II Pro XUP | hthreads |
| hyperCOS | ? | free evaluation (not open source) | embedded | ARM7, ARM9, Cortex-R, Cortex-M3, Cortex-M4F | socware | |
| 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 | ||
| INtime | Proprietary | x86 | www | |||
| IntrOS | MIT | open source | embedded, small footprint | ARM Cortex-M, STM8, AVR8 | github | |
| ITRON | T-License | varies | embedded | ARM, MIPS, x86, Renesas RX100-200-600-700-others | www | |
| ISIX | GNU LGPL | open source | Cortex-M3 | bryndza.boff.pl/index.php?dz=rozne&id=isixrtos | ||
| iRTOS | GNU LGPL | AVR, ARM7 | irtos | |||
| KolibriOS | GNU GPL | embeddable | active | x86 | www | |
| Kithara RTS | Proprietary | closed | general purpose, industrial | Windows extension, x86, x86-64, Windows XP-10 | www | |
| 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 | |
| LithOS | Proprietary | ? | embedded, industrial | LEON2-3-4, x86 | www | |
| 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 | |
| Maestro | Proprietary | closed | ARMv7-A, ARMv8-A, PowerPC64, IA-32 | www | ||
| Mark3 | BSD | open source | active, beta | ? | www | |
| MaRTE OS | GNU GPL | active | IA-32 | marte | ||
| MAX II, IV | Proprietary | ? | ? | ? | MODCOMP II, IV, ... | ? |
| MenuetOS | GNU GPL | open source | ? | active | IA-32 | www |
| 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 | |
| Milos | GNU GPL | Cortex-M3 | www | |||
| miosix | GNU GPL | stm32, efm32 e LPC2000 | www | |||
| mipOS | Proprietary | Cortex-M3, ST7, STM8, x86 | sites | |||
| Microsoft Invisible Computing (MMLite) | Proprietary | ARM7-9, i386, h8, mips, Trimedia, eCog1 | research | |||
| mLithOS | Proprietary | ? | embedded, industrial | LEON2-3-4, x86 | www | |
| MOTORCORTEX | Proprietary | server: closed, clients: open source | x86, ARM | motorcortex | ||
| 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 |
| 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 |
| Neutrino | Proprietary | some source code provided | microkernel | ARM, MIPS, PPC, SH, x86, XScale | www | |
| NI Linux Real-Time | Proprietary | developed from open source | data acquisition and process control | National Instruments CompactRIO controllers | www | |
| nOS | Mozilla | open source | embedded | AVR, MSP430, Cortex-M0-M3-M4, M16C, RX600, PIC24, Win32, POSIX, STM8 | github | |
| Nucleus RTOS | Proprietary | source code provided | ARM (Cortex-M3-M4-R4-R4F-A8-A9, ARM7-9-11), PowerPC, MIPS32-16e, microMIPS, ColdFire, SuperH | www | ||
| NUFR | Modified BSD | open source | ARM (Cortex-M0,-M3,-M4), MSP430, MSP430X (16- and 20-bit models) | ragingdist | ||
| Nut/OS | BSD | open source | embedded, industrial | AVR, AVR32, ARM7, ARM9, Cortex-M3 | www | |
| 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 | |
| OpenEPOS | Proprietary | open source | embedded | ARM, x86, AVR, MIPS, PowerPC | epos | |
| 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 |
| 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 |
| OSA | BSD | open source | PIC10-PIC24, AVR 8-bit, STM8 | wiki | ||
| OSE | Proprietary | available to customers | general purpose | ARM, PowerPC, x86, TI OMAP, … | www | |
| OS-9 | Proprietary | available to customers | embedded | ARM-strongARM, MIPS, PowerPC, SuperH, x86/Pentium, XSCALE, Motorola 6809, 680x0, SPARC | www | |
| OSEK | Mixed, open source and commercial | specification | engine control units | www | ||
| Partikle | Proprietary | ? | embedded, industrial | LEON2-3-4, x86 | www | |
| Phar Lap ETS | ? | ? | ? | ? | ? | ? |
| PaulOS | GNU GPL | open source | embedded | ? | ? | paulos |
| PICOS18 | GNU GPL | open source | ? | PIC18 | ? | |
| picoOS | Modified BSD | open source | maintenance | 6502, 80x86, ARM7, AVR, PowerPC, Cortex-M, MSP430, PIC32 | picoos | |
| Piko/RT | Modified BSD | open source | active | ARM Cortex-M3/M4 | github | |
| 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 | |
| Phoenix-RTOS | BSD | open source | embedded | ARMv7 Cortex-M, ARMv7 Cortex-A, IA-32, RISC V | www | |
| PikeOS | Proprietary | available to customers | certifiable safety & security, embedded virtualisation | PPC, x86, ARM, MIPS, SPARC-LEON, | www | |
| Portos | Proprietary | source code provided | embedded, small footprint | (ARM soon) | www | |
| POK | BSD | open source | embedded | x86, PowerPC, SPARC | pok-kernel | |
| PowerTV | Proprietary | ? | ? | ? | ? | www |
| Prex | BSD | open source | microkernel | active | ARM, IA-32 | prex |
| Protothreads | BSD | open source | general purpose | Architecture independent | dunkels | |
| pSOS | Proprietary | ? | ? | discontinued | 680x0 | ? |
| QNX | Proprietary | ? | general purpose, medical devices | active | IA-32, MIPS, PowerPC, SH-4, ARM, StrongARM, XScale | www |
| 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 | |
| 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 |
| 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 | |
| Real-time Linux (CONFIG_RT_PREEMPT) | GNU GPLv2 | open source | general purpose | same as Linux | www | |
| 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 | |
| RMX | Proprietary | closed | defunct | 8080, 8086, 80386 or higher | www | |
| 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 |
| 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 | ||
| RTLinux | GNU GPL | general purpose | inactive | same as Linux | n/a | |
| RTOS-UH[1] | Proprietary | ? | embedded | ? | 68k, 683xx, PowerPC, MPC5xx | www |
| RTOS-32 | Proprietary, royalty free | source available | embedded | active | x86 | www |
| 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 | |
| RTXC Quadros | Proprietary | source available | embedded | ARM - Atmel/Freescale/NXP/ST/TI, Blackfin, 680x0-ColdFire, PowerPC, StarCore, TI-Luminary Stellaris, TI OMAP, XScale | www | |
| RTX, RTX64 | Proprietary | closed | MS Windows extension | x86, x86-64 | www | |
| RTX Keil | Free | open source | embedded | ARM | www2 | |
| Ruff | Proprietary | closed | embedded, general purpose, industrial, IoT | ARM, MIPS, x86 | ruff | |
| 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, 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 | |
| scmRTOS | Free | open source | embedded | ARM, Cortex-M3, Blackfin, MSP430, AVR, STM8 | scmrtos | |
| SDPOS | GNU LGPL | embedded | ARM, Cortex-M3, Blackfin, PIC18, PIC24, i386 win32/linux synthetic targets | www | ||
| SHaRK | GNU GPL | ? | inactive | ? | shark | |
| silRTOS | Free | embedded | active | ARM, Cortex-M3 Cortex-A9 ARM-11MP, Blackfin, MIPS, AVR | spanidea | |
| Simba | MIT | active, beta | Arduino Nano (AVR), Arduino Mega (AVR), Arduino Due (ARM), ESP8266, ESP32, cygwin/linux | simba-os | ||
| 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 |
| StateOS | MIT | embedded, small footprint | active | ARM Cortex-M, STM8 | github | |
| Stratify OS | Modified GNU GPL or proprietary | embedded | ARM Cortex-M3, M4 | stratifylabs | ||
| Symbian OS | Eclipse | defunct | ARM | www | ||
| Talon DSP RTOS | Proprietary | ? | embedded DSP | active | TMS320 | www |
| TargetOS | Proprietary | available to customers | embedded | ARM, Cortus, Freescale ColdFire, PowerPC | www | |
| T-Kernel | T-License | source available | embedded RTOS | ARM, MIPS, SH, more | www | |
| THEOS | ? | ? | ? | ? | ? | www |
| 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 |
| TizenRT | Apache 2.0 | open source | embedded | ARM | github | |
| 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 | ||
| 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 |
| TNKernel | BSD | open source | ARM, PIC24-32-dsPIC, HCS08, STM32 (Cortex-M3) | www | ||
| TNeo | BSD | Cortex-M0-M0+-M1-M3-M4-M4F, PIC24-32-dsPIC | github | |||
| Transaction Processing Facility | Proprietary | mixed | general purpose | IBM Z series | www | |
| TRON project | Free | mixed | mixed | active | any: is a specification, not an implementation | www |
| TUD:OS | GNU GPL | open source | ? | ARM, IA-32, x86-64 | demo | |
| 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 | |
| UNIX-RTR | ? | ? | ? | defunct | PDP-11 | ? |
| uSmartx | BSD | open source | embedded | ? | ARM7TDMI, AVR, H8 | usmartx |
| µITRON | T-License | open source | embedded | active | ARM, MIPS, x86, Renesas RX100-200-600-700-others | www |
| u-velOSity | Proprietary | ? | microkernel | active | ? | www |
| velOSity | ? | ? | ? | Power ISA, ARM/XScale, MIPS, x86/Pentium, ColdFire, Blackfin, OMAP, DaVinci | www | |
| VAXELN | Proprietary | The following discussion is closed and will soon be archived. | ? | historic | VAX | en |
| VRTX | Proprietary | ? | ? | superseded by Nucleus RTOS | ARM, MIPS, PowerPC, RISC | www |
| VxWorks | Proprietary | ? | embedded | active | ARM, IA-32, Intel 64, MIPS, PowerPC, SH-4, StrongARM, xScale | www |
| Windows CE | Proprietary | Microsoft Shared Source | x86, MIPS, ARM, SuperH | www | ||
| Windows 10 IoT | Proprietary | ? | Intel Atom, Celeron and Pentium, Qualcomm Snapdragon, Broadcom, NXP i.MX | www [2][3] | ||
| Xenomai | GNU GPLv2 | open source | general | x86, x86-64, PowerPC, ARM, Analog Devices Blackfin BF52x, BF53x, BF54x and BF56x | www | |
| XINU | Free | embedded | active | x86, MIPS, ARM, AVR | xinu | |
| XMK | BSD | embedded | inactive-beta | ? | www | |
| Simulink Real-Time | Proprietary | closed | real-time testing-embedded | active | x86 | www |
| Y@SOS | GNU LGPL | open source | embedded | Cortex-M3, STM32 | www | |
| MontaVista Linux | GNU GPL | ? | www | |||
| UNOS | ? | ? | ? | historic | 680x0 | ? |
| uOS | GNU GPL | open source | embedded | active | AVR, ARM, MIPS32, MSP430, Intel i386, Linux386 | code |
| Huawei LiteOS | BSD | ARM (M0/3/4/7, A7/17/53, ARM9/11), X86, RISC-V | www | |||
| Zephyr | Apache 2.0 | ARM (Cortex-M0, Cortex-M3, Cortex-M4, Cortex-M23, Cortex-M33, Cortex-R4, Cortex-R5, Cortex-A53), x86, x86-64, ARC, RISC-V, Nios II, Xtensa | www |
References
- "Climbing and Walking Robots and the Support Technologies for Mobile Machines" 2002. p. 157. quote: "Real-Time Operating System - Universität Hannover"
- "Windows Processor Requirements". docs.microsoft.com.
- "Windows for Internet of Things (IoT) Platforms & Applications". Microsoft Windows for Business.
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