Linux-capable RISC-V HiFive Unleashed boards again orderable. – Info Linux

You can use it for almost anything you can use a computer to, but a tiny, silent, low energy computer. Processing/graphics hungry games are probably beyond it, but some examples are:

A home file server, a robot brain, a media center, an advanced router, home automation, surveillance server, information kiosk, advertising totem, ATM, car navigation/entertainment system, thin client/terminal, light computer for internet access, portable wifi hacking platform, set top box, 3d printer or CNC machine brain, inflight entertainment system, weather station or other data acquisition/recording/remote access platform, etc

Edit: note that they’re talking about a development platform, so it’d be more expensive than the current off the shelf complete SBCs out there (it needs expansion boards for interfacing with almost anything), but you can use it to develop a final product.