Quality Ensured Demonstrations (QED) is a test framework for Test Driven Development (TDD) and Behaviour Driven Development (BDD) utilizing Literate Programming techniques. QED sits somewhere between lower-level testing tools like Test::Unit and requirement specifications systems like Cucumber.

Nokogiri::Diff adds the ability to calculate the differences (added or removed nodes) between two XML/HTML documents.

Excon was designed to be simple, fast and performant. It works great as a general HTTP(s) client and is particularly well suited to usage in API clients.

Comprehensive and flexible logging library written in Ruby for use in Ruby programs. It features a hierarchical logging system of any number of levels, custom level names, logger inheritance, multiple output destinations per log event, execution tracing, custom formatting, thread safteyness, XML and YAML configuration, and more.

Rack provides a minimal, modular and adaptable interface for developing web applications in Ruby. By wrapping HTTP requests and responses, it unifies the API for web servers, web frameworks, and software in between into a single method call.

Thor is a toolkit for building powerful command-line interfaces.

cliver provides a way to detect missing command-line dependencies, including versions.

Maruku is a Markdown interpreter in Ruby. It can export Markdown to HTML, and PDF through LaTeX.

Rubocop::AST extends ruby-parser with classes used by RuboCop to deal with Ruby's Abstract Syntax Tree (AST), in particular:

• RuboCop::AST::Node

• RuboCop::AST::NodePattern

multipart-parser is a simple parser for multipart MIME messages, written in Ruby, based on felixge/node-formidable's parser. It has the following characteristics:

• Pure Ruby

• Event-driven API

• Only supports one level of multipart parsing

• Does not perform I/O

• Does not depend on any other library.

Sorbet's runtime type checking component. Sorbet is a powerful type checker for Ruby.

Mustache is a framework-agnostic way to render logic-free views. Think of Mustache as a replacement for your views. Instead of views consisting of ERB or HAML with random helpers and arbitrary logic, your views are broken into two parts: a Ruby class and an HTML template.

Erubis is a fast implementation of embedded Ruby (eRuby) with several features such as multi-language support, auto escaping, auto trimming spaces around <% %>, a changeable embedded pattern, and Ruby on Rails support.

HTMLProofer is a set of tests to validate your HTML output. These tests check if your image references are legitimate, if they have alt tags, if your internal links are working, and so on. It's intended to be an all-in-one checker for your output.

Lumberjack is a simple logging utility that can be a drop in replacement for Logger or ActiveSupport::BufferedLogger. It provides support for automatically rolling log files even with multiple processes writing the same log file.

This package provides a RubyVersion class which offers a convenient Domain Specific Language (DSL) for checking for the right Ruby version.

This package is a Standard Ruby Plugin providing configuration for rubocop-performance.

The sys-filesystem library provides a cross-platform interface for gathering file system information, such as disk space and mount points.

Multihashes provides a simple, low-level multihash implementation for Ruby. A multihash is a digest with an embedded hash function code

Samovar is a modern framework for building command-line tools and applications. It provides a declarative class-based DSL for building command-line parsers that include automatic documentation generation. It helps you keep your functionality clean and isolated where possible.

This package provides a simple, fast MySQL library for Ruby, binding to libmysql.

This package provides a implementations of custom cops that are bundled as defaults in Standard Ruby.

CharacterSet is a C-extended Ruby library to work with sets of Unicode code points. It can read and write these sets in various formats and implements the stdlib Set interface for them. It also offers an alternate paradigm of String processing which grants much better performance than Regexp and String methods from the stdlib where applicable. Many parts can be used independently, e.g.:

• CharacterSet::Character

• CharacterSet::Parser

• CharacterSet::Writer

• RangeCompressor

Guard is a command line tool to easily handle events on file system modifications. Guard automates various tasks by running custom rules whenever file or directories are modified.