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sthemer
A lightweight yet powerful solution to support multiple color schemes in your Svelte/SvelteKit application.
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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 have created a theming library for SvelteKit. We use it in a project where we have a lot of nested themes e.g. a light button rendered on a dark card that is shown on a light page. It works also well with SSR. I need to find some time to add some examples to the repo, but the docs should explain everything needed: https://github.com/ivanhofer/sthemer