Clap provides command line argument parsing features. It covers the simple case of executing code based on the flags or parameters passed.

This library provides a simple API for XML processing in Ruby.

domain_name is a Domain name manipulation library. It parses a domain name ready for extracting the registered domain and TLD (Top Level Domain). It can also be used for cookie domain validation based on the Public Suffix List.

Bacon is a small RSpec clone providing all essential features.

This package can be used to have the execution stopped for inspection in the Ruby debugger upon encountering a failure. To use it, set the RSPEC_DEBUG environment variable to true then invoke the rspec command as usual.

This Gem provides a common layer for serverspec and itamae.

Clamp provides an object-model for command-line utilities. It handles parsing of command-line options, and generation of usage help.

Em-websocket is an EventMachine based WebSocket server implementation.

This library provides functions to calculate the differences between two tree-like structures. It is similar to Ruby's built-in TSort module.

Sentry provides a gem that provides a client interface for the Sentry error logger.

Sawyer is an experimental hypermedia agent for Ruby built on top of Faraday.

This package provides a Ruby implementation of RFC5869: HKDF. The goal of HKDF is to take some source key material and generate suitable cryptographic keys from it.

rb-inotify is a simple wrapper over the inotify Linux kernel subsystem for monitoring changes to files and directories.

IO.console adds console capabilities to Ruby IO instances.

Ruby/ProgressBar is an flexible text progress bar library for Ruby. The output can be customized with a formatting system.

TestConstruct is a DSL for creating temporary files and directories during tests.

Pseudo `IO` class from and to `String`.

This package provides a MiniTest plugin for displaying the slowest tests in a minitest suite.

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

crack provides really simple JSON and XML parsing, extracted from code in Merb and Rails.

Concurrent Ruby includes concurrency tools such as agents, futures, promises, thread pools, actors, supervisors, and more. It is inspired by Erlang, Clojure, Go, JavaScript, actors, and classic concurrency patterns.

Selenium implements the W3C WebDriver protocol to automate popular browsers. It aims to mimic the behaviour of a real user as it interacts with the application's HTML. It's primarily intended for web application testing, but any web-based task can be automated. This package provides the Ruby bindings of Selenium.

Temple is an abstraction and framework for compiling templates to pure Ruby.

Assertive Expressive (AE) is an assertions library specifically designed for reuse by other test frameworks.