Eleventy 11ty
A static site generator in JavaScript, started by Zach Leatherman in 2018. It ships zero client-side JavaScript by default — which was the entire point when it arrived, in the middle of the React generators' heyday.
Its unusual property is having no template language of its own. Nunjucks, Liquid, Handlebars, EJS, Markdown, Pug and plain JavaScript functions all work side by side in the same project, which makes migrating from Jekyll unusually painless. Configuration is a single file and most projects barely need to touch it. It builds quickly, if not in Hugo's league, and produces exactly the HTML files you asked for with no runtime. Suits blogs, documentation and campaign sites. Competitors: Astro (components and selective hydration), Hugo (faster), Jekyll (older).