Mocha is a mocking and stubbing library with JMock/SchMock syntax, which allows mocking and stubbing of methods on real (non-mock) classes.

TTFunk is a TrueType font parser written in pure Ruby. It is used as part of the Prawn PDF generator.

Sorbet's runtime type checking component. Sorbet is a powerful type checker for Ruby.

Given is an RSpec extension that allows the use of Given/When/Then terminology when defining specifications, in a way similar to the Cucumber Gherkin language.

Prawn-dev contains tools to aid the development of the various Prawn projects.

This package provides a Ruby wrapper around the Terraform command line interface so that Terraform can be more easily invoked from Ruby code.

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

RedCloth is a Ruby parser for the Textile markup language.

ruby_version provides a RubyVersion module to simplify checking for the right Ruby version in software.

This Ruby library provides a simple wrapper to bcrypt, a secure hash algorithm for hashing passwords.

This library provides a simple API for XML processing in Ruby.

CukeModeler facilitates modeling a test suite that is written in Gherkin (e.g. Cucumber, SpecFlow, Lettuce, etc.). It does this by providing an abstraction layer on top of the Abstract Syntax Tree (AST) that the cucumber-gherkin generates when parsing features, as well as providing models for feature files and directories in order to be able to have a fully traversable model tree of a test suite's structure. These models can then be analyzed or manipulated more easily than the underlying AST layer.

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.

Byebug is a Ruby 2 debugger implemented using the Ruby 2 TracePoint C API for execution control and the Debug Inspector C API for call stack navigation. The core component provides support that front-ends can build on. It provides breakpoint handling and bindings for stack frames among other things and it comes with a command line interface.

SDoc is an RDoc documentation generator to build searchable HTML documentation for Ruby code.

Rouge is a code highlighter written in Ruby. It supports more than 100 languages and outputs HTML or ANSI 256-color text. Its HTML output is compatible with stylesheets designed for pygments.

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

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.

This library provides TZInfo::Data, which contains data from the IANA Time Zone database packaged as Ruby modules for use with TZInfo.

OpenURI with transparent disk caching, which is useful to avoid making excessive queries, for example when scraping web pages.

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

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

CZMQ Ruby bindings, based on the generated low-level FFI bindings of CZMQ. The focus of of CZTop is on being easy to use and providing first class support for security mechanisms.

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.