Free documentation generators

Doxygen ( ) is a documentation generator that works with many programming languages. It extracts information from specially-formatted source code comments and saves the information in one of various supported formats.

Javadoc (also capitalized as JavaDoc or javadoc) is an API documentation generator for the Java programming language. Based on information in Java source code, Javadoc generates documentation formatted as HTML and other formats via extensions. Javadoc was created by Sun Microsystems and is owned by Oracle today.

programming language

documentation generator which converts reStructuredText files into HTML

JSDoc is a markup language used to annotate and document JavaScript code. The comments can be processed by tools to produce documentation in formats such as HTML. The JSDoc specification is released under CC BY-SA 3.0, while its companion documentation generator and parser library is licensed under the Apache License 2.0.

phpDocumentor is an open-source documentation generator written in PHP. It automatically parses PHP source code and produces readable API and source code documentation, based on PHPDoc-formatted comments and the structure of the source code itself. It supports documentation of both object-oriented and procedural code. phpDocumentor runs at the command line to create documentation in HTML format. It has support for linking between documentation, incorporating user level documents like tutorials, and creation of highlighted source code with cross referencing to PHP general documentation.

is a POSIX-defined shell command for generating a C-language flow graph. The GNU implementation reads C source code files, and generates a flow graph of external references. It uses only source files and does not need to run the program. Another implementation is available in Tru64 Unix.

Noweb, stylised in lowercase as noweb, is a literate programming tool, created in 1989–1999 by Norman Ramsey, and designed to be simple, easily extensible and language independent.