PeijiSan is a Rails plugin which uses named scopes to create a thin pagination layer.

An easy way to add common finders to your Rails controllers.

Adds WSDL/SOAP and XML-RPC web service support to Action Pack

OAuth Core Ruby implementation

A Ruby on Rails authorization gem

Expandable object oriented authorization solution for Ruby/Rails applications

Persist your params in session so they are used the next time you call the same controller/action. Works with HasScope.

Personage lets your manage your user sessions.

A zero-dependency breadcrumbs gem for Rails with simple DSL, controller inheritance, and flexible view rendering.

Fake a Rails 3 site to a PHP site

Read/write php session file from Ruby on Rails

Identity and access management engine for Rails.

Currency classes that can represent GBP or Chips

Spice up your vanilla rails app with some SPA like benefits without the added complexity of a client-side JavaScript framework. From within javascript, there is no straightforward way (at least I'm aware of) to invalidate/reload a partial. Articles describing techniques such as this one have ...

Great for building APIs & reports

The piwik_analytics gem provides an easy way to include Piwik into your application. By default it will output the synchronous piwik tracking code for every page (given that it is configured correctly).

PDF printer

A lightweight gem to facilitate use of image placeholders from placehold.it

Decorator to help with the boilerplate of using Rails helpers. It gently wraps your classes to keep your views fresh.

The premise of this gem is that consumers of your API need versioning and different shapes of your resources. Without proper thought into versioning and shaping, your codebase can quickly resolve into a redundant and confusing state. ...