My 2021 Pick: SvelteKit
Svelte Kit provides the amazing developer experience of Svelte with all of the modern features of expected from a web platform.
Thetab lets you view the raw data for any chart, view it as JSON, or get a GraphQL query you can run against our public API.
My 2021 Pick: esbuild
We have been building the Remix compiler on top of esbuild and it has definitely raised the bar as far as JS bundlers are concerned. It's incredibly fast and the plugin API allows us to do pretty much anything we want.