RubyRC4 is a pure Ruby implementation of the RC4 algorithm.

Net::SCP is a pure-Ruby implementation of the SCP client protocol.

This gem provides a simple interface for classifying Ruby strings using the Unicode Script and Script_Extensions properties.

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

Metaclass is a Ruby library adding a metaclass method to all Ruby objects.

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).

Text::Hyphen is a Ruby library to hyphenate words in various languages using Ruby-fied versions of TeX hyphenation patterns. It will properly hyphenate various words according to the rules of the language the word is written in. The algorithm is based on that of the TeX typesetting system by Donald E. Knuth.

This package provides a JSON implementation written in pure Ruby.

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

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.

Yell is a comprehensive logging replacement for Ruby. It defines multiple adapters, various log level combinations and message formatting options.

This gem contains the core algorithms and classes used for doing basic programming with RDF data, implemented in pure Ruby.

GLI allows you to create command-line applications in Ruby with Git-Like Interfaces: that is, they take subcommands in the style of git and gem. GLI uses a simple domain-specific language, but retains all the power of the built-in OptionParser.

The SnakyHash Ruby library provides classes for normalizing hash keys and look-ups, and a pseudo-object interface.

Shellany is a Ruby library providing functions to capture the output produced by running shell commands.

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)\.

YARD is a documentation generation tool for the Ruby programming language. It enables the user to generate consistent, usable documentation that can be exported to a number of formats very easily, and also supports extending for custom Ruby constructs such as custom class level definitions.

Timeout provides a way to auto-terminate a potentially long-running operation if it hasn't finished in a fixed amount of time.

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

This package provides methods for benchmarking Ruby code, giving detailed reports on the time taken for each task.

The SafeYAML gem provides an alternative implementation of YAML.load suitable for accepting user input in Ruby applications.

Fuubar is an RSpec formatter that uses a progress bar instead of a string of letters and dots as feedback. It also stops on the first test failure.

Rubygems-task provides Rake tasks for managing and releasing Ruby Gems.

HighLine provides a high-level IO library that provides validation, type conversion, and more for command-line interfaces. HighLine also includes a menu system for providing multiple options to the user.