Its like Stream deck but crappier and free. Exicute macros on a PC from icons on the screen of a phone or tablet (using an app or a web browser). A functional replacement for functionality provided by expensive comercial products like stream deck.
I threw this together in under 2 hours as an example using autoit as autoit is a great general purpose macro program for windows. Run the program and load up your PCs ip address in the web browser on your mobile device.
Replace the icon fils in "www/icons" to use custom icons.
Edit the macros in the "macros" folder to set up functions to be run when hitting a button.
See https://www.autoitscript.com/autoit3/docs/license.htm for the licence to Autoit included in this package. Http server functionality made with code from https://www.autoitscript.com/forum/topic/68851-powerful-http-server-in-pure-autoit/
DB3D Dan put together a fancy android application that can be used as an alternative to the browser interface. Prebuilt APK 