I am yet to try PicoNet, which arrived in mid-2023 but didn't get photographed until September 2023. It's a sort of modern-day "EcoLink", allowing a PC to have an Econet interface and access networks. As with almost everything these days, it uses a Raspberry Pi. In this case, the Pi Pico, which is where the PicoNet gets its name from, is used. This is currently, at the time of writing anyhow, the smallest Pi, and is a tiny board which can actually be soldered on to other boards, as here.
Ken's adapter then provides headers for a standard Master series Econet module, and two Econet sockets.