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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.
Cloudflare Workers is basically a platform for deployment of Serverless Functions to a network of data-centers around the world. Their documentation says that Workers can also be used to deploy static applications as well, but I haven't looked into it or evaluated it. I know that Cloudflare is also working on another solution for deployment/hosting of static applications - Cloudflare Pages.
Cloudflare supports only one runtime - Chrome's V8. Hence, it supports natively JavaScript. For many languages like Kotlin, PHP, Python it's possible to compile programs to JavaScript. So developers can write Functions in those languages as well, they just need to have a compilation to JavaScript step.
I've been using Vercel since the start of Moiva development. It helped to bootstrap and develop Moiva fast. I'm very grateful to the developers at Vercel, they do a great job there.