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skeleton
Discontinued A fully featured UI toolkit for Svelte + Tailwind. [Moved to: https://github.com/skeletonlabs/skeleton] (by Brain-Bones)
Skeleton looks promising, but you have to buy into Tailwind CSS.
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Civic Auth
Web2 & Web3 login in a simple SDK. Drop Civic Auth into your app with native TS/JS support. Email login, SSO options, embedded wallets, and full session management. Minimal config. Deploy in under 5 minutes.
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If you are looking for something with less commitment to something opinionated, you should look into Open Props. Does not give you components, but a set of design tokens.
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headlessui
Completely unstyled, fully accessible UI components, designed to integrate beautifully with Tailwind CSS.
You’re describing https://headlessui.com/ There is a svelte port.