This gem allows you to track the previous version of an ActiveRecord model before it gets updated

Rails Engine for your pricing page.

This simple gem will help you with keeping default or primary record (one record that is marked as primary) - ie. default domain or language for site

Adds an add_primary_key method for Rails migrations.

Initializer to auto set ID, when PK is a uuid.

Description of PrintPreview.

Flip through Active Record models in order using next and previous scopes and instance methods.

Simple request stats collector for Rails applications

With PrismicRails it is simple to query the prismic.io API for a defined custom type. By providing rails helpers the integration in your rails view is much easier as before.

Enables User models in Rails 3.1+ apps to have simple private messaging capabilites between them.

Sending Messages beetween users. Rails + Devise

Private person is an active record extension gem that allows a model to be given privacy settings over arbitrary models and polymorphic relations, putting users' accounts in control of their own privacy policies.

BPMN Engine for Rails

Control application behavior by setting files in filesystem.

A Rails engine for processing PDF reports.

Process Sanity lets you list all the processes your app depends on and makes sure they are running when you start your Rails server.

Most Rails blogging tools include everything you could ever want, including things you don't. Proclaim tries to provide the simplest (yet beautiful) implementation of a blog via a mountable engine; if more functionality is desired, it can easily be combined with other engines.

A proctoring rails engine to provide proctoring features to varuious apps in a decentralised way.

This gem allows to integrate Prodamus purchases service in your Rails app or simple Ruby app.

Rails helpers for producer (producer-core gem)