Fluentd: Unified Logging Layer (project under CNCF)

Acceptance test framework for web applications

Cron jobs in Ruby

Forms made easy for Rails! It's tied to a simple DSL, with no opinion on markup.

OmniAuth is a flexible authentication system utilizing Rack middleware.

A Ruby gem to load environment variables from `.env`.

Use Webpack to manage app-like JavaScript modules in Rails

Pretty print your Ruby objects with style -- in full color and with proper indentation

Repository for collecting Locale data for Ruby on Rails I18n as well as other interesting, Rails related I18n stuff

Rails Composer. The Rails generator on steroids for starter apps.

A PhantomJS driver for Capybara

JSON Schema tools and doc generation for HTTP APIs

A Capybara driver for headless WebKit to test JavaScript web apps

The PDF::Reader library implements a PDF parser conforming as much as possible to the PDF specification from Adobe.

Official repository of the bootstrap_form gem, a Rails form builder that makes it super easy to create beautiful-looking forms using Bootstrap 5.

Ruby/ProgressBar is a text progress bar library for Ruby.

E164 international phone number normalizing, splitting, formatting.

This gem doesn't support FB Graph API v2.0+. Please use fb_graph2 gem instead.

Treat an ActiveRecord model as a file attachment, storing its patch, size, content type, etc.

A Vagrant based development environment.

High Performance Haml Implementation

A Rack and Rails plugin for building offline web applications

ActiveRecord 3 query syntax on steroids. Not currently maintained.

Deprecated (no longer maintained). Use the Rails Composer tool instead.

Amazon Product Advertising API in Ruby

Parse, validate, and format phone numbers in Ruby using Google's libphonenumber database

RSpec matchers and macros for Mongoid.

Generates a URL slug/permalink based on fields in a Mongoid-based model.

LINE Messaging API SDK for Ruby

Qiita-specified markdown processor.