Plupload lets you upload multiple files at a time and even allows drag and drop from the local file system into the browser (with Firefox and Safari). This gem/plugin tries to make its integration with Rails 3 very simple.

A linting tool that helps you find any routes defined in your routes.rb file that don't have a corresponding controller action, and find any _path or _url calls that don't have a corresponding route in the routes.rb file.

Rails 3 version of has_friends gem

A set of handy tools to upgrade your Rails application and keep it up to date

The Ajax.org Cloud9 Editor (Ace) for the Rails 3.1 asset pipeline.

CMS for Rails. For Reals.

Lookbook is a UI development environment for Ruby on Rails applications

XML parameters parser for Action Pack (removed from core in Rails 4.0)

DecentExposure helps you program to an interface, rather than an implementation in your Rails controllers. The fact of the matter is that sharing state via instance variables in controllers promotes close coupling with views. DecentExposure gives you a declarative manner of exp...

Action caching for Action Pack (removed from core in Rails 4.0)

Interactor Rails provides Rails support for the Interactor gem.

Provides a Jasmine Spec Runner that plays nicely with Rails 3.2 assets and sets up jasmine-headless-webkit

The Postmark Rails Gem is a drop-in plug-in for ActionMailer to send emails via Postmark, an email delivery service for web apps.

MS_SQL JDBC adapter for JRuby on Rails.

First-party email analytics for Rails

A plugin to make the process of creating a negative captcha in Rails much less painful

Derby JDBC adapter for JRuby on Rails.

HSQLDB JDBC adapter for JRuby on Rails.

H2 JDBC adapter for JRuby on Rails.

MySQL JDBC adapter for JRuby on Rails.