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is-even
Discontinued I created this in 2014, when I was learning how to program. (by i-voted-for-trump)
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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.
To a newcomer or even an experienced person glancing at the choices available can be too much confusing and overwhelming. There is literally a framework or library for everything. In JavaScript, you even have one for checking if the number is even and you will be amazed by its popularity Check here
Personally, I have used both ways to create websites. I one project I used MUI and tried to customize it a lot (https://github.com/theshubhagrwl/MyMovieTime) while in the other I used only Custom CSS (https://theshubhagrwl.vercel.app/) and as a user, you won't be able to spot the difference but the main difference comes in the development time and the knowledge of CSS you have.