Docsify generates your documentation website on the fly. Unlike GitBook, it does not generate static html files. Instead, it smartly loads and parses your Markdown files and displays them as a website. To start using it, all you need to do is create an index.html and deploy it on GitHub Pages.
MkDocs is a fast, simple and downright gorgeous static site generator that's geared towards building project documentation. Documentation source files are written in Markdown, and configured with a single YAML configuration file.
VuePress is a minimalistic static site generator based on Vue.js that allows developers to create fast, SEO-friendly, and customizable documentation websites.