Popular Ruby Gems projects

Nokogiri (鋸) makes it easy and painless to work with XML and HTML from Ruby. It provides a
sensible, easy-to-understand API for reading, writing, modifying, and querying documents. It is
fast and standards-compliant by relying on native parsers like libxml2, libgumbo, or xerces.

Provides API clients for AWS. This gem is part of the official AWS SDK for Ruby.

Interactive Ruby command-line tool for REPL (Read Eval Print Loop).

The fastest JSON parser and object serializer.

HTTP/REST API client library.

An easy-to-use client library for making requests from Ruby. It uses a simple method chaining system for building requests, similar to Python's Requests.

Faker, a port of Data::Faker from Perl, is used to easily generate fake data: names, addresses, phone numbers, etc.

Run Test::Unit / RSpec / Cucumber / Spinach in parallel

Curb (probably CUrl-RuBy or something) provides Ruby-language bindings for the libcurl(3), a fully-featured client-side URL transfer library. cURL and libcurl live at http://curl.haxx.se/

Einhorn makes it easy to run multiple instances of an application server, all listening on the same port. You can also seamlessly restart your workers without dropping any requests. Einhorn requires minimal application-level support, making it easy to use with an existing project.

Databases on Rails. Build a persistent domain model by mapping database tables to Ruby classes. Strong conventions for associations, validations, aggregations, migrations, and testing come baked-in.

Simple, battle-tested conventions and helpers for building web pages.

bcrypt() is a sophisticated and secure hash algorithm designed by The OpenBSD project
for hashing passwords. The bcrypt Ruby gem provides a simple wrapper for safely handling
passwords.

Ruby applications tests profiling tools.

Contains tools to analyze factories usage, integrate with Ruby profilers,
profile your examples using ActiveSupport notifications (if any) and
statically analyze your code with custom RuboCop cops.

WebMock allows stubbing HTTP requests and setting expectations on HTTP requests.

Addressable is an alternative implementation to the URI implementation that is
part of Ruby's standard library. It is flexible, offers heuristic parsing, and
additionally provides extensive support for IRIs and URI templates.

The administration framework for Ruby on Rails.

Bundler manages an application's dependencies through its entire life, across many machines, systematically and repeatably

A gem that provides a client interface for the Sentry error logger

A gem that provides Sidekiq integration for the Sentry error logger

A gem that provides Rails integration for the Sentry error logger

A Ruby implementation of SNMP (the Simple Network Management Protocol).

Provides the Binding#of_caller method.

Using binding_of_caller we can grab bindings from higher up the call stack and evaluate code in that context.
Allows access to bindings arbitrarily far up the call stack, not limited to just the immediate caller.

Recommended for use only in debugging situations. Do not use this in production apps.

stackprof is a fast sampling profiler for ruby code, with cpu, wallclock and object allocation samplers.

Provides interfaces to enumerate AWS partitions, regions, and services.