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overhide-widgets
Discontinued A free and open-sourced (mostly) ecosystem of w3c-components to make addition of "logins" and "in-app-purchases" (IAP) to your app as banal as possible.
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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.
This https://overhide.io project is a collection of microservices in support of ledger-based authorizations, a library (on npm) and now the new widgets wrapping it all.
The widgets are written with the help of FAST.design and are standard Web components, but I do have a demo using them in a react.js app.