pry-stack_explorer is a plugin for the Pry REPL that add support to navigate the call-stack.

UserAgent is a Ruby library that parses and compares HTTP User Agents.

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

Forwardable Extended provides more Forwardable methods for your source as Forwardable::Extended.

Rugged is a library for accessing libgit2 in Ruby. It gives you the speed and portability of libgit2 with the beauty of the Ruby language.

Octokit wraps the GitHub API in a flat API client that follows Ruby conventions and requires little knowledge of REST.

Cutest runs tests in separate processes to avoid shared state.

Hoe is a rake/rubygems helper for project Rakefiles. It helps manage, maintain, and release projects and includes a dynamic plug-in system allowing for easy extensibility. Hoe ships with plug-ins for all the usual project tasks including rdoc generation, testing, packaging, deployment, and announcement.

Mocha is a mocking and stubbing library with JMock/SchMock syntax, which allows mocking and stubbing of methods on real (non-mock) classes.

Arel is an SQL Abstract Syntax Tree (AST) manager for Ruby. It simplifies the generation of complex SQL queries and adapts to various relational database implementations.

Syntax Tree is a suite of tools built on top of the internal CRuby parser. It provides the ability to generate a syntax tree from source, as well as the tools necessary to inspect and manipulate that syntax tree. It can be used to build formatters, linters, language servers, and more.

Nori is a simple XML parsing ripped from Crack which in-turn ripped from Merb. It supports pluggable parsers and ships with both REXML and Nokogiri implementations.

The rubyzip module provides ways to read from and create zip files.

This gem provides a plugin for the Ruby REPL to enable opening the current line in an external editor.

Data URIs allow resources to be embedded inside a URI. The URI::Data class provides support for parsing these URIs using the normal URI.parse method.

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.

IRB is an interactive Ruby command-line tool for REPL (Read Eval Print Loop).

Unicode::DisplayWidth is a Ruby library which can determine the display width of strings in Ruby.

ruby_version provides a RubyVersion module to simplify checking for the right Ruby version in software.

This package provides a collection of RuboCop cops to check for downstream compatibility issues in the Ruby code.

This Ruby module allows you to map simple HTML back into Markdown---e.g., if you want to import existing HTML data in your application.

RSpec::Its provides the its method as a short-hand to specify the expected value of an attribute. For example, one can use its(:size)\should eq(1)\.

Parallel allows you to run any code in parallel Processes (to use all CPUs) or Threads(to speedup blocking operations). It is best suited for map-reduce or e.g. parallel downloads/uploads.

ruby-unf is a wrapper library to bring Unicode Normalization Form support to both Ruby and JRuby. It uses unf_ext on CRuby and java.text.Normalizer on JRuby.