| Operating system | Developer | First release | License |
|---|---|---|---|
| NetBSD | — | 1993 | BSD licenses |
| OpenWrt | Gábor Juhos, Florian Fainelli, Hauke Mehrtens, Jo-Philipp Wich | 2004 | GNU General Public License, version 2.0 |
| RTEMS | Sebastian Huber, Joel Sherrill | — | GNU General Public License |
| Windows Embedded Compact | Microsoft | — | end-user license agreement |