P9 looks interesting. I still haven't tried 9front yet.
Linux Namespaces Are a Poor Man's Plan 9 Namespaces https://yotam.net/posts/linux-namespaces-are-a-poor-mans-plan9-namespaces/
Discussion
I got 9front running in a virtual machine. My attempt to get it running on a Raspberry Pi was only partly successful due to driver issues.