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sk-auth
Authentication library for use with SvelteKit featuring built-in OAuth providers and zero restriction customization!
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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. Quite a bit, actually, as I'm the author of SKAuth which is an authentication library for SvelteKit and am also building a larger side project with Svelte.
It's one of the benefits of the composition API. You can find a lot of real-world composition utilities in VueUse. I can't offhand point you at too many finished examples using the composition API: I spend more time digging through open source libraries for Vue than do I looking at real-world apps in that space. But they're out there, and they're the reason I've no desire to use React until it gets something like the composition API (or svelte's compiler, which basically makes all of JS reactive).