Helps to maintain referential integrity for Rails polymorphic associations.

Alternative for ActiveRecord's Single Table Inheritance

Provides really easy tagging for rails and ActiveRecord models

Gem engine for applications in the system PayPonty

Pontiac Webhook Engine

Ponytail is a Rails engine that shows the migrations.

Poodle is a started kit for creating Rails Application. Poodle comes with built in UI (layout, css/JS) and some helpers which boost the creation of any prototype application

Popstar lets you add rules to determine your rails models popularity.

Popstar3 lets you add rules to determine your rails models popularity.

Popstar lets you add rules to determine your rails4 models popularity.

Portier is an gem that manage permissions in a rails project. The permission rules are flexible, non-obstrusive, scalable and can be applied to the controller actions, and views.

Pose ('Polymorphic Search') allows fulltext search for ActiveRecord objects.

Postablr a mountable blog engine similar with focus on tumblr entries style

A Fast and Flexible Document Database by Combining Features of Ruby and PostgreSQL with PLV8

A simple Rails blog engine powered by markdown.

SCIM v2 support for Users and Groups in Ruby On Rails

Power of Friendship is a friendship library for Rails' Active Records. It allows you to add Facebook style friendships and/or Twitter style followers to any model.

Power up RESTful resources!

Simple and flexible Ruby On Rails Ecomerce engine

A Queuing gem designed to support ActiveRecord models with an active Redis publishing component.