DbCharmer is a Rails plugin (and gem) that could be used to manage AR model connections, implement master/slave query schemes, sharding and other magic features many high-scale applications need.

Rails observer (removed from core in Rails 4.0)

A Ruby implementation of Apollo Federation

Send your application errors to our hosted service and reclaim your inbox.

A collection of lightweight, standardized, rails-oriented patterns.

Generate OpenAPI from RSpec request specs

a module for streaming dynamically generated zip files

Transactional Mailer for Mandrill

Auto-generate JSON API documents from your request-specs.

brcpfcnpj é uma das gems que compoem o Brazilian Rails

brdata é uma das gems que compoem o Brazilian Rails

brdinheiro é uma das gems que compoem o Brazilian Rails

brhelper é uma das gems que compoem o Brazilian Rails

Add the ability to use the Google Authenticator with ActiveRecord.

Protect attributes from mass assignment

Build Rails apps in a more maintainable way

Integrate Sequel with Rails (3.x and 4.x)

Reverse proxy for Ruby on Rails

Rambulance provides a simple and safe way to dynamically generate error pages.

Routing filters wraps around the complex beast that the Rails routing system is, allowing for unseen flexibility and power in Rails URL recognition and generation.