HTML Screensaver is described as 'Use any web page, HTML file, Shockwave Flash animation, PDF file, JPEG image, or any other file type supported by Internet Explorer as a screen saver' and is an app in the Development category. There are five alternatives to HTML Screensaver for Windows, Mac, Linux and Electron / Atom Shell. The best alternative is iScreensaver. It's not free, so if you're looking for a free alternative, you could try Web-Page-Screensaver or InstantStorm. Other great apps like HTML Screensaver are Screensaver Ninja (Paid) and Before Dawn (Free, Open Source).
Screensaver Ninja is a screensaver for Mac that displays web pages one after the other. Ninja allows you to turn your own computer into a dashboard for you or your colleagues, or a dedicated screen into a permanent office dashboard.
CWC Web-Page-Screensaver shows a website as the screen is turning idle. It can show locally stored html pages as well as online resources. It supports shuffling site display order. .NET Framework v4.6 is required. CWC Web-Page-Screensaver is Open Source und a free license.