Introspection provides tools to inspect the hierarchy of method definitions on a Ruby object.

This package provides a session management implementation for Rack.

Kramdown is a library for parsing and converting a superset of Markdown. It is completely written in Ruby, supports standard Markdown (with some minor modifications) and various extensions that have been made popular by the PHP Markdown Extra package and Maruku.

This package provides a set of parsers for Accept and Accept-Language HTTP headers.

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

GRPC is a high performance, open-source universal RPC framework. This package provides a ruby interface for it.

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

This package provides a Ruby extension for GNU dbm.

Orderedhash is a Ruby library providing a hash implementation that preserves the order of items and features some array-like extensions.

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.

Power-assert is an assertion library providing descriptive assertion messages for tests.

Slop provides a Ruby domain specific language for gathering options and parsing command line flags.

ruby-hydra-minimal is a Ruby library for working with hyphenation patterns. It is a low-dependency variant of ruby-hydra.

The binding_of_caller module provides the Binding#of_caller method. It allows accessing bindings from upper frames in the call stack and can evaluate code in that context.

This gems add the --watch switch to the jekyll CLI interface. It allows Jekyll to rebuild your site when a file changes.

Asciidoctor generates single-page documents. This extension splits documents up into multiple HTML pages according to their headings, with configurable levels.

This library provides a way to run code around tests in Minitest, written using either the unit test or spec style.

CI::Reporter is an add-on to Ruby testing frameworks that allows you to generate XML reports of your test runs. The resulting files can be read by a continuous integration system that understands Ant's JUnit report format.

This is an experimental gem that extracts low-level PDF functionality from Prawn.

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

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++.

HTMLProofer is a set of tests to validate your HTML output. These tests check if your image references are legitimate, if they have alt tags, if your internal links are working, and so on. It's intended to be an all-in-one checker for your output.

Rubytest is a testing meta-framework for Ruby. It can handle any compliant test framework and can run tests from multiple frameworks in a single pass.

Hamster provides 6 persistent data structures: Hash, Vector, Set, SortedSet, List, and Deque (which works as an immutable queue or stack).