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MagicMirror
MagicMirror² is an open source modular smart mirror platform. With a growing list of installable modules, the MagicMirror² allows you to convert your hallway or bathroom mirror into your personal assistant.
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SurveyJS
Open-Source JSON Form Builder to Create Dynamic Forms Right in Your App. With SurveyJS form UI libraries, you can build and style forms in a fully-integrated drag & drop form builder, render them in your JS app, and store form submission data in any backend, inc. PHP, ASP.NET Core, and Node.js.
If you would like a list to choose from, MagicMirror2 has a site with 3rd party modules listed: https://github.com/MichMich/MagicMirror/wiki/3rd-party-modules
MMM-Wallpaper, to set/rotate background images. It can take from a local source (what I use), or a variety of online sources including standard wallpapers from Bing and Amazon/FireTV, and from specified flickr, reddit, and other sources. https://github.com/kolbyjack/MMM-Wallpaper