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((Navbox
|name = Real-time operating systems
|title = [[Real-time operating system]]s (RTOS)
|bodyclass = hlist
<!-- In the sections below, different types of groupings occur, determined by the traits of various operating systems with real-time kernels.

The order is:

1. Systems based on more general cross-platform standards, protocols, or principles, more ported or portable* (then)
2. Systems based on one or very few related platforms, that are more platform-specific, less ported or portable*

Within those groups:
3. More common* (then)
4. Less common*

* Being general, cross-platform, and common involves (indicates, determines) partly, the number of central processing unit (CPU) instruction set architectures (ISA) to which software (real-time operating systems (RTOS)) has been ported and on which it can run. -->

|group1 = [[Operating system|Operating<br/>systems]]
|list1 = ((Navbox|subgroup

  |group1 = [[POSIX]] support<!-- International technical standard: CPU ISAs 24? -->
  |list1 = ((Navbox|subgroup

    |group1 = [[Unix-like]]
    |list1 =
*''[[DNIX]]''
*[[Junos OS]]
*[[LynxOS]]
*''[[Multi-Environment Real-Time]]''^ (''MERT'' – ''Unix-RT'')
*''[[OS2000]]''
*[[QNX]]^
*[[Real-Time Linux]]°
*[[RTLinux]]°
*''[[UNOS (operating system)|UNOS]]''
    |group2 = [[LiteOS]]
    |list2  =
*''[[LiteOS]]''°
    |group3 = Partial
    |list3 =
*''[[ChorusOS]]''^
*[[Integrity (operating system)|Integrity]]^
*[[Nucleus RTOS]]^
*[[NuttX]]^°
*[[Operating System Embedded]]^ (OSE)
*[[PX5 RTOS]]^
*[[RIOT (operating system)|RIOT]]^°
))

  |group2 = [[TRON project|TRON]] support<!-- International technical standard: CPU ISAs 14 -->
  |list2 = ((Navbox|subgroup

    |group1 =
    |list1 =
*[[ITRON project]]
*[[T-Kernel]]
**[[Micro T-Kernel]]
**[[T-Engine Forum]] (organization)
**[[T-License]]

    |group2 = Partial
    |list2 =
*[[eCos]]°
*[[RTEMS]]°
))

  |group3 = [[Capability-based security|Capability-based]]<!-- Security model: runs on hardware: CPU ISAs 7 -->
  |list3 =
*''[[EROS (microkernel)|EROS]]''^°
*[[seL4]]^°

  |group4 = [[Java virtual machine]]<!-- Software platforms: Java VM: operating systems 4: CPU ISAs 3; Java OSes: CPU ISAs 4 -->
  |list4 =
*''[[JavaOS#Chorus/Jazz|Chorus/Jazz]]''^ (''[[JavaOS]]'' + ''[[ChorusOS]]''^)

  |group5 = [[DOS]]<!-- Software platform: runs on hardware: CPU ISAs 5 -->
  |list5 =
*''[[Multiuser DOS]]''
**''[[Concurrent DOS]]''
**''[[FlexOS]]''
**''[[REAL/32]]''

  |group6 = [[L4 microkernel family|L4]] kernel<!-- Software platform: runs on hardware: CPU ISAs 5 -->
  |list6 =
*[[L4Linux|L<sup>4</sup>Linux]]^°
*[[PikeOS]]^
*''[[REX OS]]''^
*[[Wombat (operating system)|Wombat]]^°

  |group7 = [[Psion (company)|Psion]]<!-- Hardware platforms: CPU ISAs 3 -->
  |list7 =
*''[[EKA2]]''^° kernel → ''[[Symbian]] OS''^°

  |group8 = [[Microsoft]]<!-- Producer: CPU ISAs 5 -->
  |list8 =
*[[ThreadX]]^
*[[Windows Embedded Compact]]

  |group9 = [[IBM]]<!-- Producer: CPU ISAs 4? -->
  |list9 =
*''[[4680 OS]]''
*''[[4690 Operating System|4690 OS]]''
*[[Transaction Processing Facility]] (TPF)

  |group10 = [[Texas Instruments]]<!-- Producer: CPU ISAs 4 -->
  |list10 =
*''[[DSOS]]''
*[[TI-RTOS#RTOS kernel overview|TI-RTOS Kernel]]^°

  |group11 = [[Digital Equipment Corporation|DEC]] [[PDP-11]] [[VAX]]<!-- Producer, hardware platform: CPU ISAs 2 -->
  |list11 =
*''[[RSX-11]]''
*''[[RT-11]]''
*''[[VAXELN]]''

  |group12 = Low resource<!-- Software platform constraint: size < 6 kB -->
  |list12 =
*[[ChibiOS/RT]]^°
*[[Contiki]]°
*[[ERIKA Enterprise]]°
*FunkOS°
*[[Apache Mynewt|Mynewt]]°
*''[[Nano-RK]]''°
*[[OpenComRTOS]]^
*[[PX5 RTOS]]^
*[[RT-Thread]]° Nano
*[[RIOT (operating system)|RIOT]]°
*[[ThreadX]]^
*[[Zephyr (operating system)|Zephyr]]^°
))

*''[[BeRTOS]]''^°
*''[[DioneOS]]''
*[[Segger Microcontroller Systems|embOS]]
*[[FreeRTOS]]^°
*[[Micro-Controller Operating Systems|µC/OS]]^°
*[[Green Hills Software#Real-time operating systems|µ-velOSity]]^
*[[MQX]]^
*[[OS-9]] ([[Microware]])
*[[Phantom OS]]^°
*''[[pSOS (real-time operating system)|pSOS]]''
*''[[RMX (operating system)|RMX]]''
*[[RT-Thread]]° Standard
*[[ScreenOS]]
*''[[Sintran III]]''
*''[[THEOS]]''
*''[[Thoth (operating system)|Thoth]]''^ → ''[[Harmony (operating system)|Harmony]]''^
*[[Versatile Real-Time Executive|VRTX]]^
*[[VxWorks]]
*[[EulerOS|UniProton]]

|group2 = [[Software framework|Frameworks]], [[Software development kit|kits]]
|list2 =
*[[Robot Operating System]]° 2
*[[RTAI]]°
*[[TI-RTOS]]^°
*[[Xenomai]]°

|group3 = [[Programmer|Developers]]<!-- Entries must be a Wikipedia article. -->
|list3 =
*[[Gordon Bell (QNX)|Gordon Bell]]
*[[David Cheriton]]
*[[Dave Cutler]]
*[[Dan Dodge]]
*[[Adam Dunkels]]
*[[Ken Sakamura]]

|below =
*''Italics'' '''= discontinued'''
*'''^ = [[Microkernel]]'''
*'''° = [[Open-source software]]'''<br/>((icon|Comparison)) '''[[Comparison of real-time operating systems|Comparison]]''' ((icon|Category)) '''[[:Category:Real-time operating systems|Category]]'''
))<noinclude>
<templatedata>
{
        "params": {},
	"description": "A navbox for all Wikipedia articles about real-time computing as applied to kernels and operating systems"
}
</templatedata>
[[Category:Operating system navigational boxes]]
</noinclude>

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Template:Navbox (view source) (template editor protected)
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