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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.
There are storage services like Skynet or Filebase that operate on the sia decentralized network that can offer blob/bucket and host applications for a full cdn, but the real innovation is decentralized front ends. Checkout https://homescreen.hns.siasky.net/ its near trivial for developers to copy existing apps to add additional redundancy for circumstances like this.