Yet another role-based authorization system for Rails
Framework for real-time communication over websockets
A tagging plugin for Rails applications that allows for custom tagging along dynamic contexts.
acts_as_audited is an ActiveRecord extension that logs all changes to your models in an audits table.
ActiveRecord plugin for versioning your models.
Addressable is a replacement for the URI implementation that is part of Ruby's standard library. It more closely conforms to RFC 3986, RFC 3987, and RFC 6570 (level 4), additionally providing support for IRIs and URI templates.
A gem that allows for you to write specs for your Rails 3 generators
Autoprefixer for Ruby and Ruby on Rails
A package manager for the web
Manage your application's gem dependencies with less pain
Puma support for Capistrano 3.x
Capistrano 3.x integration for Unicorn!
Acceptance test framework for web applications
Test you ActionMailer and Mailer messages with Capybara
Provides a dead-simple way to run scenarios with Firebug enabled under the selenium driver
RackTest driver for Capybara with remote request support
Process your uploads in the background by uploading directly to S3
Chronic is a pure Ruby natural language date parser.
Compass is a Stylesheet Authoring Environment that makes your website design simpler to implement and easier to maintain.
compass rails integration
CoolTips is a replacement for conventional web-browser tooltips. Cooltips is fully unobtrusive Class based on Prototype & Script.aculo.us, which is functional without any images (pure CSS).
Asynchronous ruby framework for realtime web applications
BDD that talks to domain experts first and code second
Rails Generators for Cucumber with localized steps for Capybara and Webrat
Core library for the Ruby flavour of Cucumber
High performance memcached client for Ruby