I don't think GNU/Linux et. al. make much sense, as these things change; but I think */Linux_(kernel), */Linux_(operating system) (which then refers for */Linux_(Distributions)[1], */Android, */ChromeOS, …) would make a whole lot of sense.
[1] for Debian, Fedora, Ubuntu. et. al. – I don't like that name much, but I'm optimistic something better could be found with some head scratching…