Anyone who's wanted to play with Plan 9 should consider giving Harvey a look. Getting started is a pretty easy process: you download the repo on your Linux box

Anyone who's wanted to play with Plan 9 should consider giving Harvey a look. Getting started is a pretty easy process: you download the repo on your Linux box (I believe it works on MacOS too), run a script to get the environment set up, run a build command. Once everything's built (about 2 minutes on a decent machine), run another script which boots Harvey in a QEMU VM. The VM will get its root filesystem from the Linux box, so you can easily experiment, make changes, test. Harvey comes with pretty much everything you'd find on Plan 9. It also supports Go, and there's a (work in progress, but functional) POSIX layer which you can use to cross-compile POSIX programs.