| Operating system | Developer | First release | License |
|---|---|---|---|
| FreeRTOS | — | 2003 | MIT License |
| RTEMS | Sebastian Huber, Joel Sherrill | — | GNU General Public License |
| Zephyr | Wind River Systems, Linux Foundation | — | Apache Software License 2.0 |
| Operating system | Developer | First release | License |
|---|---|---|---|
| FreeRTOS | — | 2003 | MIT License |
| RTEMS | Sebastian Huber, Joel Sherrill | — | GNU General Public License |
| Zephyr | Wind River Systems, Linux Foundation | — | Apache Software License 2.0 |