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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.
Earlier, I mentioned that you shouldn't use a widget that automatically modifies your site and makes it accessible in one go. While this is true, there are tools to augment the development process and help you stay within the Web Content guidelines without having to memorize or to always have the guidelines as shorthand. Examples include Eslint's JSX-A11y Plugin for React users that helps you write more inclusive markup, alternatives exist for Vue, Angular and probably whatever framework or library you're using as well.