Module Stream defines an interface for external iterators.

ProgressBar is a simple library for displaying progress bars. The maximum value is configurable, and additional information can be displayed like the percentage completion, estimated time remaining, elapsed time and rate.

RDoc produces HTML and command-line documentation for Ruby projects. RDoc includes the +rdoc+ and +ri+ tools for generating and displaying documentation from the command-line.

This gem provides a DSL that makes it easy to write reports of various types in ruby. It eliminates the need to litter your source with puts statements, instead providing a more readable, expressive interface to your application.

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

ruby_engine provides an RubyEngine class that can be used to check which implementation of Ruby is in use. It can provide the interpreter name and provides query methods such as RubyEngine.mri?.

Test::Unit is unit testing framework for Ruby, based on xUnit principles. These were originally designed by Kent Beck, creator of extreme programming software development methodology, for Smalltalk's SUnit. It allows writing tests, checking results and automated testing in Ruby.

Like a modern code version of the mythical beast with 100 serpent heads, Typhoeus runs HTTP requests in parallel while cleanly encapsulating handling logic.

Prawn::Icon provides various icon fonts including FontAwesome, PaymentFont and Foundation Icons for use with the Prawn PDF toolkit.

This package provides localhost, a Ruby library for Managing a local certificate authority for self-signed, localhost development servers.

This package provides telnet client functionality.

Racc is a LALR(1) parser generator. It is written in Ruby itself, and generates Ruby program.

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.

Multihashes provides a simple, low-level multihash implementation for Ruby. A multihash is a digest with an embedded hash function code

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

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

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.

websocket-driver provides a complete implementation of the WebSocket protocols that can be hooked up to any TCP library

TZInfo is a Ruby library that provides daylight savings aware transformations between times in different time zones.

This package provides a command line interface for running for Rack applications.

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

Net::IMAP implements Internet Message Access Protocol (IMAP) client functionality. The protocol is described in IMAP.

Pleaserun is a tool to generate startup scripts and service definitions. It targets service managers such as systemd, Upstart, launchd, sysv init, and runit.

Open4 is a Ruby library to run child processes and manage their input and output.