Plan 9 - get an ISO and run Plan 9 on several hardware platforms (as usual, x86 is the initial path of least resistance), or in a virtual machine.

Inferno® is a language runtime-cum-operating system from Vita Nuova®. Inferno was originally developed at Bell Labs, and shares fundamental design concepts with Plan 9®. Namely: 1) files as a basic and consistent unit of naming; 2) a unified and unifying file-oriented network protocol, and 3) the ability to customize into a useful perspective files as per-process (in turn, per-user,...