DevDocs is an all-in-one API documentation reader with a fast, organized, and consistent interface.
dexy is a free-form literate documentation tool for writing any kind of technical document incorporating code.
docco is a quick-and-dirty, hundred-line-long, literate-programming-style documentation generator.
styledocco generates documentation and style guide documents from your stylesheets.
Ronn builds manuals. It converts simple, human readable textfiles to roff for terminal display, and also to HTML for the web.
dox is a JavaScript documentation generator written with node. Dox no longer generates an opinionated structure or style for your docs, it simply gives you a JSON representation, allowing you to use markdown and JSDoc-style tags.
jsdox is a JSDoc3 to Markdown documentation generator.
ESDoc is a good documentation generator for JavaScript.
YUIDoc is a Node.js application that generates API documentation from comments in source, using a syntax similar to tools like Javadoc and Doxygen.
coddoc is a jsdoc parsing library. Coddoc is different in that it is easily extensible by allowing users to add tag and code parsers through the use of coddoc.addTagHandler and coddoc.addCodeHandler. coddoc also parses source code to be used in APIs.
sphinx a tool that makes it easy to create intelligent and beautiful documentation