balenaOS

balenaOS is described as “a host OS tailored for containers, designed for reliability, proven in production.” It lets you run Docker containers on embedded devices, and is built on Yocto Linux, which the page cites for its portability and minimal footprint.

It also offers balenaEngine, “a container engine for IoT, based on Moby technology from Docker.” openBalena is described as free and open-source software for managing IoT devices, and the project is developed in the open.

Note: the page consulted lists example boards that look dated. Check the current device support list before committing to hardware, and verify the update mechanism in the official docs; it is not stated on the page used here.