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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.
Thanks in advance folks, if anyone would like to see any info or pics or whatever, I can post. If I haven't gone mad or blind from going thru too many lines of code. (it's hard to use things like CSSLint because of all the !importants you have to use to supercede stuff, and csslint.net flags every --variable-name as an error, so even after switching off everything but basic checking it doesnt work too well, not catching simple syntax errors even... maybe I should look into something better there)