Fleximage is a Rails plugin that tries to make image uploading and rendering super easy.

Helper methods for Rails to aid in creating Twitter Bootstrap Components

twitter-bootstrap-rails project integrates Bootstrap CSS toolkit for Rails 3.1 Asset Pipeline and turbolinks

twitter_ratchet_rails Build mobile apps with simple HTML, CSS, and JS components on Ruby on Rails

Ruby on Rails Admin Panel (Engine) to allow trusted users edit structured content.

A Rails Interface Framework using Bootstrap 5.0.2.

Ultimate UI core, base helpers and improves for Ruby on Rails Front-end

Ultimate Helpers, Rails ActionView helpers ported to CoffeeScript

Ultra light & maintainble wizards in Rails that honor REST, MVC, and OO with minimal writing of code involved and maximum flexibility

Adds extensions to the underscore javascript library. It adds the javascript as a rails engine to be included in to a Rails 3+ project. To use it make sure require underscore, underscore.string and underscore.extensions.

Unidom (UNIfied Domain Object Model) is a series of domain model engines. The Common domain model engine includes the common models. Unidom (统一领域对象模型)是一系列的领域模型引擎。常用领域模型引擎包括一些常用的模型。

A Rake task investigates the application's models definition, then tells you unique validations that do not have DB indexes.

Simple, plug & play visitor tracking by user agent (browser), IP address, referrer, and UTM parameters.

Show the random images in your Rails app or download them to use for seeding a DB

Automatically unsubscribe from emails in Rails.

Uploadbox makes easy to manage files in your Rails application.

URL validator with normalize URL from different charset

Includes functionality for site-specific registration and third-party authentication strategies such as social networks (Facebook, Twitter and Linkedin) and freemail providers (Yahoo, Windows Live and Gmail) with support for external database authentication.

Simple pattern for keeping track of messages sent to users based on model events with different templates.

This adds Uservoice support to your Rails application including single sign-on.