Chosen is a javascript library of select box enhancer for jQuery and Protoype. This gem integrates Chosen with Rails asset pipeline for easy of use.

PostgreSQL JSONB-based model changes tracking

Link header pagination for Rails and Grape APIs

N+1 auto-detection for Rails with zero false positives / false negatives

Hooks Roadie into your Rails application to help with email generation.

jQuery plugin for drop-in fix binded events problem caused by Turbolinks

Use your angular templates with rails' asset pipeline

Feature rich logging framework that replaces the Rails logger.

A thin wrapper to use Rails Migrations in non Rails projects

XML parameters parser for Action Pack (removed from core in Rails 4.0)

Haml-rails provides Haml generators for Rails 3. It also enables Haml as the templating engine for you, so you don't have to screw around in your own application.rb when your Gemfile already clearly indicated what templating engine you have installed. Hurrah.

A wysiwyg text editor for Bootstrap

Integration between Ember CLI and Rails

Easy upload management for ActiveRecord

Deliver assets for Rails.

A plugin for versioning Rails based RESTful APIs.

The library allows you to easily build datagrid aka data tables with sortable columns and filters

Deface is a library that allows you to customize ERB, Haml and Slim views in a Rails application without editing the underlying view.

A native development UI for ViewComponent

The minitest-spec-rails gem makes it easy to use the \ Minitest::Spec DSL within your existing Rails test suite.