WWTD is a Travis Simulator that lets you run test matrices defined in .travis.yml on your local machine, using rvm, rbenv, or chruby to test different versions of Ruby.

Ruby-Locale is the pure ruby library which provides basic APIs for localization.

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

Promise is a Ruby implementation of the Promises/A+ specification. It provides 100% mutation coverage, tested on MRI 1.9, 2.0, 2.1, 2.2, Rubinius, and JRuby.

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.

rubocop is a Ruby code style checking tool. It aims to enforce the community-driven Ruby Style Guide.

Kramdown is a library for parsing and converting a superset of Markdown. It is completely written in Ruby, supports standard Markdown (with some minor modifications) and various extensions that have been made popular by the PHP Markdown Extra package and Maruku.

This library provides Ruby qFFI bindings to the libsass library. This enables rendering SASS from Ruby code.

The binding_of_caller module provides the Binding#of_caller method. It allows accessing bindings from upper frames in the call stack and can evaluate code in that context.

The Stud Ruby library adds a few things missing from the standard Ruby library such as:

Stud::Try

Retry on failure, with back-off, where failure is any exception.

Stud::Pool

Generic resource pools.

Stud::Task

Tasks (threads that can return values, exceptions, etc.)

Stud.interval

Interval execution (do X every N seconds).

Stud::Buffer

Batch and flush behavior.

Mercenary is a lightweight and flexible library for writing command-line apps in Ruby.

Minitest-global_expectations allows continued use of expectation methods on all objects. Calling expectation methods on all objects was deprecated in minitest 5.12, and is planned to be removed from minitest 6.

ruby-hydra-minimal is a Ruby library for working with hyphenation patterns. It is a low-dependency variant of ruby-hydra.

Archive::Tar::Minitar is a pure-Ruby library and command-line utility that provides the ability to deal with POSIX tar archive files.

This package allows loading, parsing and cascading Cascading Style Sheets (CSS) rule sets in Ruby.

This package provides a class to deal with collections of unordered, unique values

fog is a Ruby cloud services library. This package provides shared classes and tests for fog providers and services.

Loofah is a general library for manipulating and transforming HTML/XML documents and fragments. It's built on top of Nokogiri and libxml2.

Erubi is a ERB template engine for Ruby. It is a simplified fork of Erubis

Swagger::Diff is a utility for comparing two different Open API Initiative (OAI) specifications (formerly known as Swagger specifications). It is intended to determine whether a newer API specification is backwards-compatible with an older API specification.

This package provides a RuboCop plugin that can be used for code style checking of Capybara test files (RSpec, Cucumber, Minitest).

Asciidoctor Diagram is a set of Asciidoctor extensions that enable you to add diagrams, which you describe using plain text, to your AsciiDoc document. The extension will run the appropriate diagram processor to generate an image from the input text. The generated image is then inserted into your converted document.

Detailed usage instructions can be found on the Asciidoctor documentation site.

Asciidoctor Diagram was inspired by the AsciiDoc PlantUML filter.

Ruby Rsync is a Ruby library that can synchronize files between remote hosts by wrapping the rsync binary.

This RSpec plugin allows you to use block_is_expected similarly to how you would use is_expected if a block was wrapping the subject.