How to: Documentation
* [AnnotateRb](https://github.com/drwl/annotaterb) - Adds database schema annotations for your ActiveRecord models as text comments as well as routes. An active and maintained hard fork of Annotate.
* [Apipie](https://github.com/Apipie/apipie-rails) - Rails API documentation and display tool using Ruby syntax.
* [Asciidoctor](https://asciidoctor.org) - A fast, Ruby-based text processor & publishing toolchain for converting AsciiDoc to HTML5, DocBook, EPUB3, PDF & more.
* [Documentation](https://github.com/adamcooke/documentation) - A Rails engine to provide the ability to add documentation to a Rails application.
* [fitting](https://github.com/tuwilof/fitting) - Library add improve test log for RSpec and WebMock, validate its according to API Blueprint and Open API, show the documentation coverage with log.
* [GitHub Changelog Generator](https://github.com/github-changelog-generator/github-changelog-generator) - Automatically generate change log from your tags, issues, labels and pull requests on GitHub.
* [Gollum](https://github.com/gollum/gollum) - A simple, Git-powered wiki with a sweet API and local frontend.
* [grape-swagger](https://github.com/ruby-grape/grape-swagger) - Add swagger compliant documentation to your Grape API.
* [Hanna](https://github.com/rdoc/hanna-nouveau) - An RDoc formatter built with simplicity, beauty and ease of browsing in mind.
* [Hologram](https://github.com/trulia/hologram) - A markdown based documentation system for style guides. It parses comments in your CSS and helps you turn them into a beautiful style guide.
* [Inch](https://github.com/rrrene/inch) - Inch is a documentation measurement and evalutation tool for Ruby code, based on YARD.
* [RDoc](https://github.com/ruby/rdoc) - RDoc produces HTML and command-line documentation for Ruby projects.
* [rspec_api_documentation](https://github.com/zipmark/rspec_api_documentation) - Automatically generate API documentation from RSpec.
* [YARD](http://yardoc.org) - YARD enables the user to generate consistent, usable documentation that can be exported to a number of formats very easily.