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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.
Seems odd that the strap-line (on the repo and main site, not just here) doesn't mention what might be its distinguishing feature. I've seen several general comment plugins like this, though not that sign the comments (as mentioned lower down https://licom.fly.dev/).
Though it doesn't say what use these signatures are put to (and I've not looked into the code). If there is no identity associated with the keys they don't prove the message comes from someone specific, just that the message hasn't been tampered with and came from the same person as other messages thusly signed.