The Stud Ruby library adds a few things missing from the standard Ruby library such as:

Stud::Try

Retry on failure, with back-off, where failure is any exception.

Stud::Pool

Generic resource pools.

Stud::Task

Tasks (threads that can return values, exceptions, etc.)

Stud.interval

Interval execution (do X every N seconds).

Stud::Buffer

Batch and flush behavior.

Benchmark-ips enhances the Ruby Benchmark module with the iterations per second count. For short snippets of code, it can automatically figure out how many times to run the code to get interesting data.

This package provides a collection of text algorithms: Levenshtein, Soundex, Metaphone, Double Metaphone, Porter Stemming.

This package provides a module for encoding and decoding (X)HTML entities.

This library provides functions to calculate the differences between two tree-like structures. It is similar to Ruby's built-in TSort module.

Erubis is a fast implementation of embedded Ruby (eRuby) with several features such as multi-language support, auto escaping, auto trimming spaces around <% %>, a changeable embedded pattern, and Ruby on Rails support.

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

RR is a test double framework that features a rich selection of double techniques and a terse syntax.

crack provides really simple JSON and XML parsing, extracted from code in Merb and Rails.

Timers offers a collections of one-shot and periodic timers, intended for use with event loops such as async.

This package provides a Jekyll plugin to generate an Atom feed of your Jekyll posts.

This package allows loading, parsing and cascading Cascading Style Sheets (CSS) rule sets in Ruby.

Concurrent Ruby includes concurrency tools such as agents, futures, promises, thread pools, actors, supervisors, and more. It is inspired by Erlang, Clojure, Go, JavaScript, actors, and classic concurrency patterns.

This package provides Ruby FFI bindings to the Networking and Cryptography (NaCl) library, also known as libsodium. This provides a high-level toolkit for building cryptographic systems and protocols.

This gem provides the classes LinkHeader and LinkHeader::Link, which represent HTTP Link headers conforming to RFC 5988. Objects can be constructed from and converted to text or a JSON-friendly Array representation. They can also be used to generate corresponding HTML link elements.

This package provides a Ruby library to perform different operations with permutations of sequences, such as strings and arrays.

Common protocol buffer types used by Google APIs

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.).

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

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)\.

Rack middleware that can be used to protect against typical web attacks. It can protect all Rack apps, including Rails. For instance, it protects against cross site request forgery, cross site scripting, clickjacking, directory traversal, session hijacking and IP spoofing.

Maruku is a Markdown interpreter in Ruby. It can export Markdown to HTML, and PDF through LaTeX.

Delayed_job (or DJ) encapsulates the common pattern of asynchronously executing longer tasks in the background. It is a direct extraction from Shopify where the job table is responsible for a multitude of core tasks.

BlankSlate provides an abstract base class with no predefined methods (except for __send__ and __id__). BlankSlate is useful as a base class when writing classes that depend upon method_missing (e.g. dynamic proxies).