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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.
Semantic UI is a front-end development framework similar to bootstrap. It is designed for theming. It contains prebuilt semantic components that help create beautiful and responsive layouts using friendly HTML syntax. It integrates React, Angular Ember, etc. It uses gulp build tools to help your project preserve its theme changes. Gulp is a javascript tool that allows you to automate tasks like builds, minification, compilation, etc. You can read more about it here: https://react.semantic-ui.com/.