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Bootstrap
The most popular HTML, CSS, and JavaScript framework for developing responsive, mobile first projects on the web.
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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.
I suppose depending on what you're after exactly would boil down to roughly two options: CMS or component libraries. I assume CMSes are off the table since you're looking for more customization, especially for backend. Component libraries I had most experience with are bootstrap (https://getbootstrap.com/), angular material for angular or materialize (materializecss.com/).
I suppose depending on what you're after exactly would boil down to roughly two options: CMS or component libraries. I assume CMSes are off the table since you're looking for more customization, especially for backend. Component libraries I had most experience with are bootstrap (https://getbootstrap.com/), angular material for angular or materialize (materializecss.com/).