MonitorControl - Control your external monitor brightness&volume on your Mac
ESPRESSObin - Electronics, Single Board Computer, and x86
Lunar.fyi - Control monitor brightness, adapt using the ambient light sensor, adjust volume, switch inputs and turn off displays without fiddling with clunky buttons.
Udoo x86 Ultra - Udoo x86 Ultra is a modern PC, known as the most powerful X86 maker board and an Arduino 101 compatible platform.
Screens - GNU Screen.
Intel NUC boards - Four-by-four inch Intel NUC boards come with a soldered-on processor.