Starlight
Documentation sites on Astro, with self-hosted full-text search built in rather than bolted on. Mix React, Vue, or Svelte components in one site. Still pre-1.0 after three years.
Documentation
Category: Documentation under Developer Tools
VitePress
Vue and Vite powered documentation sites. Markdown in, static HTML out, with a build fast enough that large sites stay pleasant. The stable line has been quiet for about a year.
Sphinx
The documentation generator behind Python itself. One plain-text source builds a website, a PDF, and an API reference pulled from your code. reStructuredText is the learning tax.
Docusaurus
Documentation as code. Your content stays as Markdown in your own Git repo and ships as static HTML you host anywhere. Search is the one piece you still solve yourself.