Weylus
Use your tablet as graphic tablet/touch screen on your computer
Weylus turns your tablet or smart phone into a graphic tablet/touch screen for your computer!
No apps except a modern browser (Firefox 80+, iOS/iPadOS 13+) are required on your tablet.
Start Weylus, preferably set an access code in the access code box and press the Start button. This will start a webserver running on your computer. To control your computer with your tablet you need to open the url http://<address of your computer>:<port set in the menu, default is 1701>, if possible Weylus will display to you the url you need to open and show a QR code with the encoded address. If you have a firewall running make sure to open a TCP port for the webserver (1701 by default) and the websocket connection (9001 by default).