With Amountable, you can easily attach, organize and sum Ruby money fields to your models without migrating.

biggs is a small ruby gem/rails plugin for formatting postal addresses from over 60 countries.

Bootstrap-ify pagination with Kaminari - Compatible with Bootstrap 2.x, 3.x

Brainstem allows you to create rich API presenters that know how to filter, sort, and include associations.

The spicy feature toggle framework

An awesome, flexible, powerful, useful, tricky and liar Rails 3 recommendations engine.

Sharding and replication support for ActiveRecord

Add web components to the Rails asset pipeline

Preload factories (Factory Bot) just like fixtures. It will be easier and, probably, faster!

Preseed reusable data for factory girl

A smarter way of doing many-to-many relationships in Rails.

Loader to solve N+1 issue for good.

newscast - newsreader for easy (re)use - build your own facebook newsfeed in 1-2-3 steps in 5 minutes

Improve perceived performance of your rails application with minimum effort

pluto - Another Planet Generator (Lets You Build Web Pages from Published Web Feeds)

pluto-news - newsreader for easy (re)use - build your own facebook newsfeed in 1-2-3 steps in 5 minutes

Easily write arbitrary filters

Proof provides an easy-to-use JWT-based authentication system.

PunchingBag is a hit counting and simple trending engine for Ruby on Rails

Debugging toolbar for Rack applications implemented as middleware. Based on logical-insight and rack-bug.