Comment by frumplestlatz

A lot of deployments essentially virtualize Linux or run portions of NetBSD (e.g. via their "rump" kernel mechanism) to achieve driver support, file systems, etc. That's not really a general-purpose solution, though.

There is work within major consumer product companies building such things (either with sel4, or things based on sel4's ideas), and there's Genode on seL4.