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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.
a long time ago i wrote https://github.com/rektide/git-ts , which posted git commit checksums to https://publictimestamp.org, which was a public service one could submit hashes to which would attest to them. hosted by linux foundation for a while. i really wish the website were still up to explain the project, even if it's offline. i loved having a way to say- yes, this commit is indeed from when it says it was.
there'a a ton of attestation stuff going on in cloud land these days, often under lofty objectives like "supply chain security".