3rd party dependency-free solution how to monitor performance of your Rails applications.

Apartment allows Rack applications to deal with database multitenancy through ActiveRecord

Easily switch current user to speed up development

Gemstash acts as a local RubyGems server, caching copies of gems from RubyGems.org automatically, and eventually letting you push your own private gems as well.

Open-source Dropbox using Ruby and Git.

Socialization allows any model to Follow and/or Like any other model. This is accomplished through a double polymorphic relationship on the Follow and Like models. But you don't need to know that since all the complexity is hidden from you.

Tolk is a web interface for doing i18n translations packaged as an engine for Rails applications.

APN on Rails is a Ruby on Rails gem that allows you to easily add Apple Push Notification (iPhone) support to your Rails application.

Plugin for the PaperTrail gem to track and reify associations

This gem creates a scope for unread objects and adds methods to mark objects as read

ROXML is a Ruby library designed to make it easier for Ruby developers to work with XML. Using simple annotations, it enables Ruby classes to be mapped to XML. ROXML takes care of the marshalling and unmarshalling of mapped attributes so that developers can focus on building first-class Ruby classes. As a result, ROXML simplifies the development of RESTful applications, Web Services, and XML-RPC.

Out-of-Band Server Triggered DOM Operations

Test your Rails Engines without needing a full Rails app

Authy plugin to add two factor authentication to Devise. This gem is deprecated, please see the README for details.

Often times you'll end up with empty strings where you really want nil at the database level. This plugin automatically converts blanks to nil and is configurable.

Easy model creation and reference in your cucumber features

Rails performance tests (removed from core in Rails 4.0)

Supplies TimeOfDay and Shift class that includes parsing, strftime, comparison, and arithmetic.

Deprecated finder APIs extracted from Active Record.

The EmailAddress Gem to work with and validate email addresses.