Take a URL of running web site, download pages, and package as PWA that can run disconnected!
"PWA.tools takes data from your site and uses that to generate cross-platform Progressive Web Apps"
Take a single image, and create set of required logo images and thumbnails for
Windows 10, Android, iOS etc... Very useful!
"Quickly and easily create app icons for various platforms in the right size and format"
link from .NET Rocks! vNext