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storybook
Storybook is a frontend workshop for building UI components and pages in isolation. Made for UI development, testing, and documentation.
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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.
There's an exploration happening to move storybook's dev server from express to fastify, but you're right, currently it's using http/1.1. I've had a hard time finding real-world benchmarks of h2 perf gains with many requests, but anecdotally in my own Vite app (not my storybook), which fetches 450 resources on page load, enabling h2 in Vite did not make a noticeable difference. I'm hopeful that fastify/h2/h3/quic might indeed give some good gains in the future, though.