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react-admin
A frontend Framework for building data-driven applications running on top of REST/GraphQL APIs, using TypeScript, React and Material Design
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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.
For the admin panel, or basically anything with basic crud operations, take a look at https://marmelab.com/react-admin/. Most frontend devs don't like it, since it limits you somewhat in customization, but at the same time, it is very easy to grasp for someone coming from a backend dev profile, who just wants a crud UI. It even has a guesser template that proposes an initial screen layout based on the response of your api, which you can then copy-paste and finetune. It is really made to make quick admin crud ui's.