Perambulate is an address parsing library for natural language addresses. It provides a broken-down version of a passed address, allowing you to get one input value and do useful things on the chunks.

Ruby library for querying and mapping data through generic interfaces

Phil_columns adapter for factory_girl gem. See README for more details.

Pickle MongoDB allows you to write BDD steps to interact with your MongoDB database, you can create and interrogate the database using the handy built in steps

Pihsi is a open source toolkit for Speech Recognition based on PocketSphinx.

Automated release notes for apps hosted on pivotaltracker.com. Allows release notes to be generated for any project on pivotaltracker.com by retrieving the latest iteration for the specified project and displaying the completed features, bugs, and chores.

counter_cache, but much more powerful

A CMS engine for Ruby On Rails projects using mongodb. Featuring customizable page types, url nodes and more

This extension provides contiguous positionning capabilities to your ActiveRecord models.

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

Adds a preload_pluck method to ActiveRecord that allows querying using Rails 4 preload-style eager loading, and return a 2-dimensional array without ActiveRecord model creation overhead.

Prestashop WebService API library

Price history with easy.

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

An easy, and extensible transactional event notification add on for Spree.

This gem should support you when using rails scaffold (or a lot of simple CRUD models/views/controllers) in a programmable fashion, removing repeated code when possible and making it configurable

Promonizr is a gem to connect with API REST of promotions

Protected is a gem for rails that gives you user authorization, administration, auditing in a mountable Engine

A command line utility which connects to a Panasonic PABX via *telnet* and retrieve calling information. Filters valuable content while keeping the original fixed-space format.

Official Qiita:Team Services Integration