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</style><table class="infobox vevent"><tbody><tr><th colspan="2" class="infobox-above" style="background-color: #e0e0e0;">RT-Thread</th></tr><tr><th scope="row" class="infobox-label" style="white-space: nowrap;"><a href="Programmer" title="Programmer">Developer</a></th><td class="infobox-data">Bernard Xiong & RT-Thread Team</td></tr><tr><th scope="row" class="infobox-label" style="white-space: nowrap;"><a href="Programming_language" title="Programming language">Written in</a></th><td class="infobox-data"><a href="C_(programming_language)" title="C (programming language)">C</a></td></tr><tr><th scope="row" class="infobox-label" style="white-space: nowrap;">Working state</th><td class="infobox-data">Current</td></tr><tr><th scope="row" class="infobox-label" style="white-space: nowrap;">Source model</th><td class="infobox-data"><a href="Open_source" title="Open source">Open source</a></td></tr><tr><th scope="row" class="infobox-label" style="white-space: nowrap;">Initial release</th><td class="infobox-data">2006<span style="display:none"> (<span class="bday dtstart published updated">2006</span>)</span></td></tr><tr><th scope="row" class="infobox-label" style="white-space: nowrap;"><a href="Software_release_life_cycle" title="Software release life cycle">Latest release</a></th><td class="infobox-data">4.0.3 / December 31, 2020<span style="display:none"> (<span class="bday dtstart published updated">2020-12-31</span>)</span></td></tr><tr><th scope="row" class="infobox-label" style="white-space: nowrap;"><a href="Repository_(version_control)" title="Repository (version control)">Repository</a></th><td class="infobox-data"><style data-mw-deduplicate="TemplateStyles:r1126788409">
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</style><div class="plainlist"><ul><li><span class="url"><a rel="nofollow" class="external text" href="https://github.com/RT-Thread/rt-thread">github<wbr>.com<wbr>/RT-Thread<wbr>/rt-thread</a></span> </li></ul>
</div></td></tr><tr><th scope="row" class="infobox-label" style="white-space: nowrap;">Marketing target</th><td class="infobox-data"><a href="Embedded_system" title="Embedded system">Embedded systems</a>, <a href="Internet_of_things" title="Internet of things">IoT</a></td></tr><tr><th scope="row" class="infobox-label" style="white-space: nowrap;">Supported platforms</th><td class="infobox-data"><a href="ARM_architecture" class="mw-redirect" title="ARM architecture">ARM</a> (<a href="ARM_Cortex-M0" class="mw-redirect" title="ARM Cortex-M0">Cortex-M0</a>, <a href="ARM_Cortex-M3" class="mw-redirect" title="ARM Cortex-M3">-M3</a>, <a href="ARM_Cortex-M4" class="mw-redirect" title="ARM Cortex-M4">-M4</a>, <a href="ARM_Cortex-M7" class="mw-redirect" title="ARM Cortex-M7">-M7</a>, <a href="ARM_Cortex-M23" class="mw-redirect" title="ARM Cortex-M23">-M23</a>, <a href="ARM_Cortex-R" title="ARM Cortex-R">-R4</a>, <a href="ARM_Cortex-A" title="ARM Cortex-A">-A8</a>, <a href="ARM_Cortex-A" title="ARM Cortex-A">-A9</a>; <a href="ARM7" title="ARM7">ARM7</a>, <a href="ARM9" title="ARM9">ARM9</a>, <a href="ARM11" title="ARM11">ARM11</a>), <a href="MIPS_architecture" title="MIPS architecture">MIPS32</a>, <a href="RISC-V" title="RISC-V">RISC-V</a>, <a href="ARC_(processor)" title="ARC (processor)">ARC</a>, <a href="Texas_Instruments_TMS320" class="mw-redirect" title="Texas Instruments TMS320">TMS320 DSP</a>, C-Sky, <a href="X86" title="X86">x86</a></td></tr><tr><th scope="row" class="infobox-label" style="white-space: nowrap;"><a href="Kernel_(operating_system)" title="Kernel (operating system)">Kernel</a> type</th><td class="infobox-data"><a href="Monolithic_kernel" title="Monolithic kernel">Monolithic</a></td></tr><tr><th scope="row" class="infobox-label" style="white-space: nowrap;"><a href="Software_license" title="Software license">License</a></th><td class="infobox-data"><a href="Apache_License_2.0" class="mw-redirect" title="Apache License 2.0">Apache 2.0</a></td></tr><tr><th scope="row" class="infobox-label" style="white-space: nowrap;">Official website</th><td class="infobox-data"><span class="url"><a rel="nofollow" class="external text" href="http://www.rt-thread.io">www<wbr>.rt-thread<wbr>.io</a></span></td></tr></tbody></table>
<p><b>RT-Thread</b> is an <a href="Open-source" class="mw-redirect" title="Open-source">open-source</a> <a href="Real-time_operating_system" title="Real-time operating system">real-time operating system</a> (RTOS) for <a href="Embedded_system" title="Embedded system">embedded systems</a> and <a href="Internet_of_things" title="Internet of things">Internet of things</a> (IoT).<sup id="cite_ref-RTT-Home_1-0" class="reference"><a href="#cite_note-RTT-Home-1"><span class="cite-bracket">[</span>1<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-RTT-GitHub_2-0" class="reference"><a href="#cite_note-RTT-GitHub-2"><span class="cite-bracket">[</span>2<span class="cite-bracket">]</span></a></sup> It is developed by the RT-Thread Development Team based in <a href="China" title="China">China</a>. RT-Thread is aimed to change the current situation in China that there is no well used open-source real-time operating system in the <a href="Microcontroller" title="Microcontroller">microcontroller</a> field.
</p><p>As of August 2020, RT-Thread was reported to be #3 on the list of RTOSes with the largest number of contributors (behind <a href="Zephyr_(operating_system)" title="Zephyr (operating system)">Zephyr</a> and <a href="Mbed" title="Mbed">Mbed</a>).<sup id="cite_ref-3" class="reference"><a href="#cite_note-3"><span class="cite-bracket">[</span>3<span class="cite-bracket">]</span></a></sup>
</p>
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<div class="mw-heading mw-heading2"><h2 id="Variants">Variants</h2></div>
<p>In 2006, RT-Thread began as an open-source real-time operating system (RTOS) that is mainly written in the <a href="Programming_language" title="Programming language">programming language</a> <a href="C_(programming_language)" title="C (programming language)">C</a>. In 2017, a second variant was released for resource-constrained microcontrollers; it needs a minimum of 3 kB <a href="Flash_memory" title="Flash memory">flash memory</a> or <a href="Read-only_memory" title="Read-only memory">read-only memory</a> (ROM) and 1.2 kB <a href="Random-access_memory" title="Random-access memory">random-access memory</a> (RAM). Also, RT-Thread's first variant was named <i>Standard</i>, and second variant was named <i>Nano</i>.<sup id="cite_ref-RTT-Home_1-1" class="reference"><a href="#cite_note-RTT-Home-1"><span class="cite-bracket">[</span>1<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-RTT-GitHub_2-1" class="reference"><a href="#cite_note-RTT-GitHub-2"><span class="cite-bracket">[</span>2<span class="cite-bracket">]</span></a></sup>
</p>
<div class="mw-heading mw-heading2"><h2 id="See_also">See also</h2></div>
<ul><li><a href="Embedded_system" title="Embedded system">Embedded system</a></li>
<li><a href="Microcontroller" title="Microcontroller">Microcontroller</a></li>
<li><a href="Single-board_microcontroller" title="Single-board microcontroller">Single-board microcontroller</a></li></ul>
<div class="mw-heading mw-heading2"><h2 id="References">References</h2></div>
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<li id="cite_note-RTT-Home-1"><span class="mw-cite-backlink">^ <a href="#cite_ref-RTT-Home_1-0"><sup><i><b>a</b></i></sup></a> <a href="#cite_ref-RTT-Home_1-1"><sup><i><b>b</b></i></sup></a></span> <span class="reference-text"><style data-mw-deduplicate="TemplateStyles:r1238218222">
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</style><cite class="citation web cs1"><a rel="nofollow" class="external text" href="https://www.rt-thread.io">"RT-Thread 启动下一代RTOS演化"</a>.</cite></span>
</li>
<li id="cite_note-RTT-GitHub-2"><span class="mw-cite-backlink">^ <a href="#cite_ref-RTT-GitHub_2-0"><sup><i><b>a</b></i></sup></a> <a href="#cite_ref-RTT-GitHub_2-1"><sup><i><b>b</b></i></sup></a></span> <span class="reference-text"><cite class="citation web cs1"><a rel="nofollow" class="external text" href="https://github.com/RT-Thread/rt-thread">"RT-Thread github"</a>. <i><a href="GitHub" title="GitHub">GitHub</a></i>. 23 October 2022.</cite></span>
</li>
<li id="cite_note-3"><span class="mw-cite-backlink"><b><a href="#cite_ref-3">^</a></b></span> <span class="reference-text"><cite class="citation web cs1"><a rel="nofollow" class="external text" href="https://youtube.com/watch?v=jR5E5Kz9A-k">"Introduction to the Zephyr RTOS"</a>. Nordic Semiconductor. October 6, 2020.</cite></span>
</li>
</ol></div></div>
<div class="mw-heading mw-heading2"><h2 id="External_links">External links</h2></div>
<ul><li><span class="official-website"><span class="url"><a rel="nofollow" class="external text" href="http://www.rt-thread.io">Official website</a></span></span></li>
<li><a rel="nofollow" class="external text" href="https://github.com/RT-Thread">RT-Thread</a> on <a href="GitHub" title="GitHub">GitHub</a></li>
<li><a rel="nofollow" class="external text" href="https://gitee.com/rtthread/rt-thread">gitee repository</a></li></ul>
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</style><div id="Real-time_operating_systems_(RTOS)556" style="font-size:114%;margin:0 4em"><a href="Real-time_operating_system" title="Real-time operating system">Real-time operating systems</a> (RTOS)</div></th></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="Operating_system" title="Operating system">Operating<br>systems</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"></div><table class="nowraplinks navbox-subgroup" style="border-spacing:0"><tbody><tr><th scope="row" class="navbox-group" style="width:1%"><a href="POSIX" title="POSIX">POSIX</a> support</th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"></div><table class="nowraplinks navbox-subgroup" style="border-spacing:0"><tbody><tr><th scope="row" class="navbox-group" style="width:1%"><a href="Unix-like" title="Unix-like">Unix-like</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em">
<ul><li><i><a href="DNIX" title="DNIX">DNIX</a></i></li>
<li><a href="Junos_OS" title="Junos OS">Junos OS</a></li>
<li><a href="LynxOS" title="LynxOS">LynxOS</a></li>
<li><i><a href="Multi-Environment_Real-Time" title="Multi-Environment Real-Time">Multi-Environment Real-Time</a></i>^ (<i>MERT</i> – <i>Unix-RT</i>)</li>
<li><i><a href="OS2000" title="OS2000">OS2000</a></i></li>
<li><a href="QNX" title="QNX">QNX</a>^</li>
<li><a href="Real-Time_Linux" class="mw-redirect" title="Real-Time Linux">Real-Time Linux</a>°</li>
<li><a href="RTLinux" title="RTLinux">RTLinux</a>°</li>
<li><i><a href="UNOS_(operating_system)" title="UNOS (operating system)">UNOS</a></i></li></ul>
</div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="LiteOS" title="LiteOS">LiteOS</a></th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em">
<ul><li><i><a href="LiteOS" title="LiteOS">LiteOS</a></i>°</li></ul>
</div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Partial</th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em">
<ul><li><i><a href="ChorusOS" title="ChorusOS">ChorusOS</a></i>^</li>
<li><a href="Integrity_(operating_system)" title="Integrity (operating system)">Integrity</a>^</li>
<li><a href="Nucleus_RTOS" title="Nucleus RTOS">Nucleus RTOS</a>^</li>
<li><a href="NuttX" title="NuttX">NuttX</a>^°</li>
<li><a href="Operating_System_Embedded" class="mw-redirect" title="Operating System Embedded">Operating System Embedded</a>^ (OSE)</li>
<li><a href="PX5_RTOS" title="PX5 RTOS">PX5 RTOS</a>^</li>
<li><a href="RIOT_(operating_system)" title="RIOT (operating system)">RIOT</a>^°</li>
<li><a href="RTEMS" title="RTEMS">RTEMS</a>°</li></ul>
</div></td></tr></tbody></table><div></div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="TRON_project" title="TRON project">TRON</a> support</th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"></div><table class="nowraplinks navbox-subgroup" style="border-spacing:0"><tbody><tr><td colspan="2" class="navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em">
<ul><li><a href="ITRON_project" title="ITRON project">ITRON project</a></li>
<li><a href="T-Kernel" title="T-Kernel">T-Kernel</a>
<ul><li><a href="Micro_T-Kernel" title="Micro T-Kernel">Micro T-Kernel</a></li>
<li><a href="T-Engine_Forum" title="T-Engine Forum">T-Engine Forum</a> (organization)</li>
<li><a href="T-License" title="T-License">T-License</a></li></ul></li></ul>
</div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Partial</th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em">
<ul><li><a href="ECos" title="ECos">eCos</a>°</li>
<li><i><a href="RTEMS" title="RTEMS">RTEMS</a>°</i></li></ul>
</div></td></tr></tbody></table><div></div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="Capability-based_security" title="Capability-based security">Capability-based</a></th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em">
<ul><li><i><a href="EROS_(microkernel)" title="EROS (microkernel)">EROS</a></i>^°</li>
<li><a href="SeL4" class="mw-redirect" title="SeL4">seL4</a>^°</li></ul>
</div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="Java_virtual_machine" title="Java virtual machine">Java virtual machine</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em">
<ul><li><i><a href="JavaOS#Chorus/Jazz" title="JavaOS">Chorus/Jazz</a></i>^ (<i><a href="JavaOS" title="JavaOS">JavaOS</a></i> + <i><a href="ChorusOS" title="ChorusOS">ChorusOS</a></i>^)</li></ul>
</div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="DOS" title="DOS">DOS</a></th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em">
<ul><li><i><a href="Multiuser_DOS" title="Multiuser DOS">Multiuser DOS</a></i>
<ul><li><i><a href="Concurrent_DOS" class="mw-redirect" title="Concurrent DOS">Concurrent DOS</a></i></li>
<li><i><a href="FlexOS" title="FlexOS">FlexOS</a></i></li>
<li><i><a href="REAL/32" class="mw-redirect" title="REAL/32">REAL/32</a></i></li></ul></li></ul>
</div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="L4_microkernel_family" title="L4 microkernel family">L4</a> kernel</th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em">
<ul><li><a href="L4Linux" title="L4Linux">L<sup>4</sup>Linux</a>^°</li>
<li><a href="PikeOS" title="PikeOS">PikeOS</a>^</li>
<li><i><a href="REX_OS" title="REX OS">REX OS</a></i>^</li>
<li><a href="Wombat_(operating_system)" title="Wombat (operating system)">Wombat</a>^°</li></ul>
</div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="Psion_(company)" title="Psion (company)">Psion</a></th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em">
<ul><li><i><a href="EKA2" title="EKA2">EKA2</a></i>^° kernel → <i><a href="Symbian" title="Symbian">Symbian</a> OS</i>^°</li></ul>
</div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="Microsoft" title="Microsoft">Microsoft</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em">
<ul><li><a href="ThreadX" title="ThreadX">ThreadX</a>^</li>
<li><a href="Windows_Embedded_Compact" class="mw-redirect" title="Windows Embedded Compact">Windows Embedded Compact</a></li></ul>
</div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="IBM" title="IBM">IBM</a></th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em">
<ul><li><i><a href="4680_OS" class="mw-redirect" title="4680 OS">4680 OS</a></i></li>
<li><i><a href="4690_Operating_System" title="4690 Operating System">4690 OS</a></i></li>
<li><a href="Transaction_Processing_Facility" title="Transaction Processing Facility">Transaction Processing Facility</a> (TPF)</li></ul>
</div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="Texas_Instruments" title="Texas Instruments">Texas Instruments</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em">
<ul><li><i><a href="DSOS" title="DSOS">DSOS</a></i></li>
<li><a href="TI-RTOS#RTOS_kernel_overview" title="TI-RTOS">TI-RTOS Kernel</a>^°</li></ul>
</div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="Digital_Equipment_Corporation" title="Digital Equipment Corporation">DEC</a> <a href="PDP-11" title="PDP-11">PDP-11</a> & <a href="VAX" title="VAX">VAX</a></th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em">
<ul><li><i><a href="RSX-11" title="RSX-11">RSX-11</a></i></li>
<li><i><a href="RT-11" title="RT-11">RT-11</a></i></li>
<li><i><a href="VAXELN" title="VAXELN">VAXELN</a></i></li></ul>
</div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Low resource</th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em">
<ul><li><a href="ChibiOS/RT" title="ChibiOS/RT">ChibiOS/RT</a>^°</li>
<li><a href="Contiki" title="Contiki">Contiki</a>°</li>
<li><a href="ERIKA_Enterprise" title="ERIKA Enterprise">ERIKA Enterprise</a>°</li>
<li>FunkOS°</li>
<li><a href="Apache_Mynewt" title="Apache Mynewt">Mynewt</a>°</li>
<li><i><a href="Nano-RK" title="Nano-RK">Nano-RK</a></i>°</li>
<li><a href="OpenComRTOS" title="OpenComRTOS">OpenComRTOS</a>^</li>
<li><a href="PX5_RTOS" title="PX5 RTOS">PX5 RTOS</a>^</li>
<li>° Nano</li>
<li><a href="RIOT_(operating_system)" title="RIOT (operating system)">RIOT</a>°</li>
<li><a href="RTEMS" title="RTEMS">RTEMS</a>°</li>
<li><a href="ThreadX" title="ThreadX">ThreadX</a>^</li>
<li><a href="Zephyr_(operating_system)" title="Zephyr (operating system)">Zephyr</a>^°</li></ul>
</div></td></tr></tbody></table><div>
<ul><li><i><a href="BeRTOS" title="BeRTOS">BeRTOS</a></i>^°</li>
<li><i><a href="DioneOS" title="DioneOS">DioneOS</a></i></li>
<li><a href="Segger_Microcontroller_Systems" title="Segger Microcontroller Systems">embOS</a></li>
<li><a href="FreeRTOS" title="FreeRTOS">FreeRTOS</a>^°</li>
<li><a href="Micro-Controller_Operating_Systems" title="Micro-Controller Operating Systems">µC/OS</a>^°</li>
<li><a href="Green_Hills_Software#Real-time_operating_systems" title="Green Hills Software">µ-velOSity</a>^</li>
<li><a href="MQX" title="MQX">MQX</a>^</li>
<li><a href="OS-9" title="OS-9">OS-9</a> (<a href="Microware" title="Microware">Microware</a>)</li>
<li><a href="Phantom_OS" title="Phantom OS">Phantom OS</a>^°</li>
<li><i><a href="PSOS_(real-time_operating_system)" title="PSOS (real-time operating system)">pSOS</a></i></li>
<li><i><a href="RMX_(operating_system)" title="RMX (operating system)">RMX</a></i></li>
<li>° Standard</li>
<li><a href="ScreenOS" title="ScreenOS">ScreenOS</a></li>
<li><i><a href="Sintran_III" title="Sintran III">Sintran III</a></i></li>
<li><i><a href="THEOS" title="THEOS">THEOS</a></i></li>
<li><i><a href="Thoth_(operating_system)" title="Thoth (operating system)">Thoth</a></i>^ → <i><a href="Harmony_(operating_system)" title="Harmony (operating system)">Harmony</a></i>^</li>
<li><a href="Versatile_Real-Time_Executive" title="Versatile Real-Time Executive">VRTX</a>^</li>
<li><a href="VxWorks" title="VxWorks">VxWorks</a></li>
<li><a href="EulerOS" title="EulerOS">UniProton</a></li></ul></div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="Software_framework" title="Software framework">Frameworks</a>, <a href="Software_development_kit" title="Software development kit">kits</a></th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em">
<li><a href="Robot_Operating_System" title="Robot Operating System">Robot Operating System</a>° 2</li>
<li><a href="RTAI" title="RTAI">RTAI</a>°</li>
<li><a href="TI-RTOS" title="TI-RTOS">TI-RTOS</a>^°</li>
<li><a href="Xenomai" title="Xenomai">Xenomai</a>°</li>
</div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="Programmer" title="Programmer">Developers</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em">
<ul><li><a href="Gordon_Bell_(QNX)" title="Gordon Bell (QNX)">Gordon Bell</a></li>
<li><a href="David_Cheriton" title="David Cheriton">David Cheriton</a></li>
<li><a href="Dave_Cutler" title="Dave Cutler">Dave Cutler</a></li>
<li><a href="Dan_Dodge" title="Dan Dodge">Dan Dodge</a></li>
<li><a href="Adam_Dunkels" title="Adam Dunkels">Adam Dunkels</a></li>
<li><a href="Ken_Sakamura" title="Ken Sakamura">Ken Sakamura</a></li></ul>
</div></td></tr><tr><td class="navbox-abovebelow" colspan="2"><div>
<ul><li><i>Italics</i> <b>= discontinued</b></li>
<li><b>^ = <a href="Microkernel" title="Microkernel">Microkernel</a></b></li>
<li><b>° = <a href="Open-source_software" title="Open-source software">Open-source software</a></b><br><span class="noviewer" typeof="mw:File"><span title="List-Class article"></span></span> <b><a href="Comparison_of_real-time_operating_systems" title="Comparison of real-time operating systems">Comparison</a></b> <span class="noviewer" typeof="mw:File"><span title="Category"></span></span> <b>Category</b></li></ul>
</div></td></tr></tbody></table></div>
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