murugaperumal-ramasamy

active_presenter

The presenter library you already know.

acts_as_list

An ActiveRecord plugin for managing lists.

autotuner

doorkeeper

Doorkeeper is an OAuth 2 provider for Ruby on Rails / Grape.

faker

A library for generating fake data such as names, addresses, and phone numbers.

fontcustom

Generate custom icon webfonts from the comfort of the command line.

gc_stats

Ruby gem that provides garbage collection statistics for your Rails application

has_flexiblefields

Rails plugin. Adds extra fields in a has one relationship to an existing model - includes definition and definition entries to label extra fields

i18n

Internationalization (i18n) library for Ruby

minitest

minitest provides a complete suite of testing facilities supporting TDD, BDD, mocking, and benchmarking.

prototype-rails

Add RJS, Prototype, and Scriptaculous helpers to Rails 3.1+ apps — This fork tries to fix it for the latest RCs.

seed-fu

Advanced seed data handling for Rails, combining the best practices of several methods together.

twitter

A Ruby interface to the Twitter API.