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An authorization Rails plugin using a declarative DSL for specifying authorization rules in one place

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Object-based searching (and more) for simply creating search forms. Not currently maintained.

event_calendar
Show multiple, overlapping events across calendar days and rows. Rails plugin.

active_scaffold
Save time and headaches, and create a more easily maintainable set of pages, with ActiveScaffold. ActiveScaffold handles all your CRUD (create, read, update, delete) user interface needs, leaving you

inherited_resources

active_merchant
Active Merchant is a simple payment abstraction library extracted from Shopify. The aim of the project is to feel natural to Ruby users and to abstract as many parts as possible away from the user to

geokit
Official Geokit Gem. Geokit gem provides geocoding and distance/heading calculations. Pair with the geokit-rails plugin for full-fledged location-based app functionality.

exception_notification
NOTICE: official repository moved to https://github.com/smartinez87/exception_notification

cucumber-rails
Rails Generators for Cucumber with special support for Capybara and DatabaseCleaner

communityengine
Adds basic social networking capabilities to your existing application, including users, blogs, photos, clippings, favorites, and more.

rails3-jquery-autocomplete
An easy and unobtrusive way to use jQuery's autocomplete with Rails 3

searchlogic
Searchlogic provides object based searching, common named scopes, and other useful tools.

geokit-rails
Official Geokit plugin for Rails/ActiveRecord. Provides location-based goodness for your Rails app. Requires the Geokit gem.

radiant
Radiant is a no-fluff, open source content management system designed for small teams.

rails_admin
RailsAdmin is a Rails engine that provides an easy-to-use interface for managing your data

carrierwave
Classier solution for file uploads for Rails, Sinatra and other Ruby web frameworks

simple-navigation
A ruby gem for creating navigations (with multiple levels) for your Rails 2, Rails 3, Rails 4, Sinatra or Padrino applications. Render your navigation as html list, link list or breadcrumbs.

mobile-fu
Automatically detect mobile requests from mobile devices in your Rails application.

mongoid-paperclip
Mongoid::Paperclip enables you to use Paperclip with the Mongoid ODM for MongoDB.

acts-as-taggable-on
A tagging plugin for Rails applications that allows for custom tagging along dynamic contexts.

hominid
Hominid is a Ruby gem that provides a wrapper for interacting with the Mailchimp API.

rails-nginx-passenger-ubuntu
Instructions on how to get up and running with nginx and passenger on Ubuntu 8.04 server

spork
A DRb server for testing frameworks (RSpec / Cucumber currently) that forks before each run to ensure a clean testing state.

pdfkit
A Ruby gem to transform HTML + CSS into PDFs using the command-line utility wkhtmltopdf

rails3-application-templates
Deprecated (no longer maintained). Use the Rails Composer tool instead.

tiny_mce
A Ruby on Rails plugin (pre-Rails 3.1) that allows easy implementation of the TinyMCE editor into your applications.

enki
A Ruby on Rails blogging app for the fashionable developer. It's better than Mephisto or SimpleLog

pickle
Easy model creation/reference in cucumber - optionally leveraging your factories/blueprints

contacts
A universal interface to import email contacts from various providers including Yahoo, Gmail, Hotmail, AOL and Plaxo.

subdomain-fu
A new plugin approach to attempting to solve the usage of subdomains in linking and routing in Rails projects.

apartment
NOTE: The official repository for apartment has now been moved to https://github.com/influitive/apartment

restful-authentication
Generates common user authentication code for Rails/Merb, with a full test/unit and rspec suite and optional Acts as State Machine support built-in.
