Eleventy is a free, open-source static site generator that enables developers to build fast, flexible websites with minimal client-side JavaScript. It supports a wide range of template languages, including HTML, Markdown, Liquid, Nunjucks, and more, allowing for a highly customizable development experience. Eleventy is designed to be zero-config by default, offering flexible configuration options to suit various project needs. It works with your project's existing directory structure, enabling incremental adoption without requiring a complete overhaul. Additionally, Eleventy does not track users, ensuring privacy and a focus on delivering content without unnecessary overhead.