ZEIT Day Keynote highlighted the growth of Next.js, a popular open-source project, with over 25,000 stars on GitHub and 10,000 websites powered by it. The production-ready Next.js 6 was introduced, featuring zero-configuration static exports, improved integration test suites, flow annotations, and better error handling. The new release also includes Babel 7, JSX fragments, first-class TypeScript support, and a revamped documentation platform at nextjs.org, which now features all the Next.js documentation in one place, alongside tutorials and a showcase of impressive projects built with Next.js.