If you own a Logitech mouse, keyboard or controller, you can use Arx Control that's part of Logitech Gaming Software.
Requirements:
Logitech Gaming Software
Smartphone or tablet with Arx Control App installed on it (available on googleplay or applestore)
Computer connected on a Wi-Fi router
Logitech Mouse, Keyboard or controller
Arx Control has a built-in system monitoring applet. Allows you to view it on your smartphone or tablet (computer and tablet/smart phone must be connected to same Wi-Fi network). Only down said to Arx Control, not that many applets for it.
https://www.logitechgpromo.com/arxpromo/ Has a list of submitted applets, people have made.
I think that is why Logitech hasn't made a new G15/G19 keyboards with a full color screen on it. Using people smartphone or tablet allows them to keep cost down.