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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.
It depends on your needs & requirements for your website, I recommend you ARForms form builder plugin for WordPress site to design forms in different post / pages wherever you want, Yoast is best for SEO coz I have some issues with rankmath plugin for setting up some tags, Sucuri is best for security of your site, if you are running service based website and also getting appointments for the services you should check BookingPress plugin for appointment booking facilities.