Display system notifications (dbus, growl and snarl) after running tests. It works on Mac OS X, Linux and Windows. Powerful when used with Autotest ZenTest gem for Rails apps.

A RESTful CouchDB client based on Heroku's RestClient and Couch.js - you want the version at http://github.com/couchrest/couchrest

A simple universally unique ID generation library.

Resque is a Redis-backed Ruby library for creating background jobs, placing them on multiple queues, and processing them later.

A Resque plugin that enables complete control over your running Resque Workers, all from the Resque-Web UI

Guard::Jasmine automatically tests your Jasmine specs on Rails when files are modified.

ActsAsList plugin

Classier solution for file uploads for Rails, Sinatra and other Ruby web frameworks

Namespaced Rack::Session, Rack::Cache, I18n and cache Redis stores for Ruby web frameworks

Extraction of the ActiveRecord::Base#import functionality from ar-extensions for Rails 3 and beyon