This is the skeleton of a presentation using reveal.js and socket.io, allowing you to use your web browser to give a presentation controlled from any other device (smartphone).
See the demo for reveal here and the github repo here.
Do npm install then npm start.
You need node/nodemon and npm.
You can see the barebones HTML presentation at localhost/8080, and the controller at localhost/8080/controller. Pushing buttons on a controller open in any window will affect presentations in any other window as long as they are all connected to the same server.