rake db:clone[manual] provides a CLI for selecting a specific source database to copy to a specific destination database. Supports postgreql and mysql.

A database schema management tool that reads a "single-source-of-truth" schema definition from a ruby file and auto-migrates the database to conform to it.

Spending hours in the rails console? Spruce it up and show off those hard-working hands! Debbie replaces IRB with Pry, improves output through awesome_print, and has some other goodies up its sleeves.

Simple and composable validation and coercion of data structures inspired by clojure specs

A Redis-backed shortener url service.

This library makes it easy to declare protocols and use in in functional way.

Bulk rename of ebook files (pdf, epub, mobi) based on embedded metadata

Enchant is tool aimed to discover web application directory and pages by fuzzing the requests using a dictionary approach

Want to migrate your Ruby on Rails application from Heroku (or similar) up to Engine Yard AppCloud? This is the tool for you.

EnhancedErrors will automatically enhance your errors with messages containing variable values from the moment they were raised, using no extra dependencies, and only Ruby's built-in TracePoint.

Simple API for HTTP requests to Entrez E-utilities

SDK for interacting with the ESP API.

Europe is a simple library for retrieving EU government data such as VAT information, VAT validation, currency exchange rates and country information.

Gem for easier Rails development.

Facteur allows you add a messaging system in your Rails 3. You can create many mailboxes for your users. They will be able to send and receive messages.

Facturación Electrónica de Costa Rica

Faker extension providing japanese names

Find theaters and movies on sale near a given postal code

Very fast LRU + TTL cache

Provides a nice DSL to describe your CSV document. CSV documents can be validated against this description. You can easily define types like Integer or Array for CSV through converters.