Docco is described as 'quick-and-dirty documentation generator, written in Literate CoffeeScript. It produces an HTML document that displays your comments intermingled with your code. All prose is passed through Markdown, and code is passed through Highlight.js syntax highlighting' and is a Documentation Generators in the Development category. There are more than 10 alternatives to Docco for a variety of platforms, including Self-Hosted solutions, Linux, Mac, Windows and npm. The best alternative is MkDocs, which is both free and Open Source. Other great apps like Docco are Docsify.js (Free, Open Source), Docpress (Free, Open Source), Antora (Free, Open Source) and Orchid (Free, Open Source).
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.
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 website. All you need to do is create an index.
hexo-theme-doc is a documentation theme for Hexo, the fast and powerful blog framework powered by Node.js. It differs from other Hexo themes by allowing you to present documentation—especially REST API documentation.
ditto inspired by flatdoc is a markdown code documentation system, capable of producing documentation similar to Three.js and Backbone.js, check out live demo here. It is designed for people who use Github Pages to host their code documentation, but you can also host it yourself.