I use one for the clock in my bedroom. I use FullPageOS to load a web page that contains the time, date and weather (Open Weather gives you 60 checks per minute for free - way more than I need). The clock is on a full size monitor so the wife and I can see it without our glasses on.

I basically deployed a nodejs app and configured FullPageOS to load that local page. The clock itself is just HTML and JavaScript (jQuery, bootstrap, moment.js) - there is no servers side code beyond basically the "connect+serve-static to server the index.html file.

Oh, and it plays the comet from Star Trek Deep Space Nine's Title Credits on the hour in the background.