A quite old Dell XPS 13 with the battery removed (there are youtube videos on how to do that). It's very quite, low power usage and much faster than something l

A quite old Dell XPS 13 with the battery removed (there are youtube videos on how to do that). It's very quite, low power usage and much faster than something like a Raspberry Pi. Only limitation is that it doesn't have ethernet ports, so I needed a USB 3 to ethernet adapter. But those exist in usb-hub form and work quite well.