RGL is a framework for graph data structures and algorithms. The design of the library is much influenced by the Boost Graph Library (BGL) which is written in C++.

Launchy is helper class for launching applications in a fire and forget manner. The aim of Launchy is to provide a common approach to launching external applications from within Ruby programs.

Liquid is a template language written in Ruby. It is used to load dynamic content on storefronts.

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

BibTeX-Ruby is the Rubyist's Swiss Army knife for all things BibTeX. It includes a parser for all common BibTeX objects and a sophisticated name parser that tokenizes correctly formatted names. BibTeX-Ruby recognizes BibTeX string replacements, joins values containing multiple strings or variables, supports cross-references, and decodes common LaTeX formatting instructions to unicode. If you are in a hurry, it also allows for easy export/conversion to formats such as YAML, JSON, CSL, and XML (BibTeXML).

Oedipus Lex is a lexer generator in the same family as Rexical and Rex. It is based primarily on generating code much like you would a hand-written lexer. It uses StrScanner within a multi-level case statement. As such, Oedipus matches on the first match, not the longest.

The Polyglot library allows a Ruby module to register a loader for the file type associated with a filename extension, and it augments require to find and load matching files.

Jekyll is a simple, blog aware, static site generator.

The test-queue module is a parallel test runner, built using a centralized queue to ensure optimal distribution of tests between workers. It is specifically optimized for Continuous Integration (CI) environments: build statistics from each run are stored locally and used to sort the queue at the beginning of the next run.

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

Rack middleware that can be used to protect against typical web attacks. It can protect all Rack apps, including Rails. For instance, it protects against cross site request forgery, cross site scripting, clickjacking, directory traversal, session hijacking and IP spoofing.

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

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.

m stands for metal, a better test/unit and minitest test runner that can run tests by line number.

This pure ruby library provides spawn() which is almost perfectly compatible with ruby 1.9's.

BRASS (Bare-Metal Ruby Assertion System Standard) is a basic foundational assertions framework for other assertion and test frameworks to make use of.

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

This package provides a collection of RuboCop cops to check for performance optimizations in Ruby code.

This library provides Ruby bindings for the Mac OSX FSEvents API.

This package adds custom processing for warnings for Ruby, including the ability to ignore specific warning messages, ignore warnings in specific files/directories, include backtraces with warnings, treat warnings as errors, deduplicate warnings, and add custom handling for all warnings in specific files/directories.

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.

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.

Bio-logger is a wrapper around Log4r adding extra logging features such as filtering and fine grained logging.

Ruby Bindings for the GNU LibIDN library, an implementation of the Stringprep, Punycode and IDNA specifications. These are used to encode and decode internationalized domain + names according to the IDNA2003 specifications.

Included are the most important parts of the Stringprep, Punycode and IDNA APIs like performing Stringprep processings, encoding to and decoding from Punycode strings and converting entire domain names to and from the ACE encoded form.