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homescreen
Discontinued Homescreen provides a way for users to save fully decentralized, immutable versions of application front-ends.
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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.
I am not sure if you are aware, but in case you or anyone reading aren't, Skynet and Handshake have been partners for over a year and has full compatibility not only as a decentralized domain service for Skynet sites and apps, but it also works with Homescreen. Give it ago by typing sky-os.hns or riftapp.hns in the Homescreen search bar to install the app. Ethereum Name Service (ENS) and IPFS domains are also compatible with homescreen for those developers that prefer to use those.