Addressable is a replacement for the URI implementation that is part of Ruby's standard library. It more closely conforms to RFC 3986, RFC 3987, and RFC 6570 (level 4), providing support for IRIs and URI templates.

PandocRuby is a wrapper for Pandoc, a Haskell library with command line tools for converting one markup format to another. Pandoc can convert documents from a variety of formats including markdown, reStructuredText, textile, HTML, DocBook, LaTeX, and MediaWiki markup to a variety of other formats, including markdown, reStructuredText, HTML, LaTeX, ConTeXt, PDF, RTF, DocBook XML, OpenDocument XML, ODT, GNU Texinfo, MediaWiki markup, groff man pages, HTML slide shows, EPUB, Microsoft Word docx, and more.

This RSpec plugin can be used to stub environment variables in a scoped context for testing.

ValueSemantics generates modules that provide conventional value semantics for a given set of attributes. The behaviour is similar to an immutable Struct class, plus extensible, lightweight validation and coercion.

The Wapiti-Ruby gem provides a wicked fast linear-chain CRF API for sequence segmentation and labelling. It is based on the codebase of Wapiti.

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

Oj is a JSON parser and generator for Ruby, where the encoding and decoding of JSON is implemented as a C extension to Ruby.

This gem provides a Power Assert implementation for Minitest. It is inspired by the test-unit-power_assert gem.

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

IO.console adds console capabilities to Ruby IO instances.

This library allows rendering Scalable Vector Graphics (SVG) graphics directly into a Portable Document Format (PDF) document using the Prawn module.

Namae (名前) is a parser for human names. It recognizes personal names of various cultural backgrounds and tries to split them into their component parts (e.g., given and family names, honorifics etc.).

Rubytest CLI is a command-line interface for running tests for Rubytest-based test frameworks. It provides the rubytest executable.

Excon was designed to be simple, fast and performant. It works great as a general HTTP(s) client and is particularly well suited to usage in API clients.

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

Bio-commandeer provides an opinionated method of running shell commands from within Ruby. The advantage of bio-commandeer over other methods of running external commands is that when something goes wrong, messages printed to the STDOUT and STDERR streams are reported, giving extra detail to ease debugging.

Bake Test External adds a test:external action to the bake command to run the test suites of dependent projects to check for breakage.

Gettext is a GNU gettext-like program for Ruby. The catalog file (po-file) used is the same as that used by GNU gettext, allowing you to use GNU gettext tools for maintenance.

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.

Bond can autocomplete argument(s) to methods, uniquely completing per module, per method and per argument. Bond provides a configuration system and a DSL for creating custom completions and completion rules. Bond can also load completions that ship with gems. Bond is able to offer more than irb's completion since it uses the full line of input when completing as opposed to irb's last-word approach.

This package provides an alternative implementation of the Ruby GetText library that is approximately 12x faster yet thread safe.

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.

MultiXml provides swappable XML backends utilizing either LibXML, Nokogiri, Ox, or REXML.

This package extends the String class and adds a ColorizedString with methods to set text color, background color, and text effects.