Hopscotch is a framework for making product tours on web pages. This gem makes it easy to include the framework into a Rails app.

Hosts is a Ruby library able to read or manipulate the operating system's host files. When manipulating it tries to preserve their original formatting.

Callstack and memory profiler

Rails 3 Engine for using the Houdini Mechanical Turk API

Matches your project config to give the same errors as HoundCi

Configuration files and other snippets to help you apply standards across multiple projects

HowIs has been renamed to Inq. Use that instead!

A http router for Rack and Padrino.

Hatena Syntax parser for Ruby

HPE 3PAR Software Development Kit for Ruby

A <hr /> tag for your terminal

Prepends 'http://' to what appears to be absolute links that are missing a protocol. For example: "www.example.com/some/path" can be assumed to mean "http://www.example.com/some/path"

Convert HTML document to Microsoft Word document. This gem is in active development.

Ruby library for creating Docx from HTML output

Export list of html or xhtml files to pdfs with 'wkhtmltopdf'

Ruby wrapper for kangax js library html-minifier. If you want pure ruby use html_press

Render Markdown via HTML::Pipeline in Rails.

A html-pipeline filter that converts youtube url into iframe

Ruby gem for compressing html

The html-table library provides an interface for generating HTML tables in a syntax comfortable to Ruby programmers, but with some enforcement of where certain elements can be placed.