Use raw SQL to insert database records in bulk. Supports uniqueness constraints, timestamps, and checking for existing records.

FinePrint allows site admins to easily create, update and ask users to sign site agreements, keeping a record of when users signed a certain version of each agreement.

Treat fixtures like factories and factories like fixtures

Flattens the Active Admin interface, and allows easy customisation of your Admin backends

It provides an easier way to create denormalized records to be used for reporting, includes generation of migration file.

FlyData Agent

Run every test in a fork to avoid pollution and get clean output per test

View Photos and iPhoto libraries in your browser

Gamification is a collection of models for Ruby on Rails that allows you to make anything a game

Genealogy is a ruby gem library which extends ActiveRecord models in order to make its instances act as relatives so that you can build and query genealogies

Caches retrieved information to your user profile and reuses it when you query again.

Use Google Tag Manager ( http://www.google.com/tagmanager/ ) in your Rails application.

Because Blogojevich would be too tough to remember. It's a pluggable blogging system for Rails 3.

GraphQL + JWT + Devise

GraphQL::QueryResolver is an add-on to graphql-ruby that allows your field resolvers to minimize N+1 SELECTS issued by ActiveRecord.

Provide `notice` method to user model to save notices and to shows them later in views with Gritter (growl-like jQuery plugin). Fully support of Rails flash messages also. Helpful to send flash messages from background jobs.

Hanmoto provides a simple way to manage public pages with Asset Pipeline.

The essential security auditing tool for Internet of Things devices you'll need in your toolbox

Provides an easy way to work with bit fields in active record

Moderated fields or whole model instances are serialized and saved into a separate moderations table. The moderation can then be accepted and the changes will be applied to the model. This way, lookups for existing, accepted fields or entries will be much faster than if using something like Papertrail, since the changes that have not yet been accepted are stored outside of the model table - in the moderations table.