UrlSlug is a slug/permalink plugin with ActiveRecord and I18n support. It lets you create SEO friendly URLs.

Usernames for ActiveRecord models.

This gem adds notifications to your app, you can display the notifications where you want, add a dropdown on your header for example. Add views, mailer views and go !

Easy user notification for your Rails application. Provides Notifiable model with details about actions performed by your users, like adding comments, responding etc.

Adds some OpenID authentication methods to an ActiveRecord model

CSS and JS utility toolbox for Rails

Providing a flexible alias for column names in ActiveRecord.

Validate HTML files as they leave your app by rack or by mail or by turbo-stream

validate-response is a gem for bringing error messages from one or more ActiveRecord objects to the unified structure & highlight validation errors in forms (ajax supported).

A extension activemodel's validations to validation step by step.

Rails 3 generator plugin that generates validator's skeleton files.

Assets for vboxremote

Verboten Keys is a last line of defense to help prevent you and your team from accidentally leaking private information via your APIs.

Easily manage a version number for your Rails app. The version is stored in a YAML file within your app.

Official VHX Styleguide

Show Double Click for Publishers (DFP) ads over https for single page web apps

Vident with Phlex

Vident with typed attributes

Vident with ViewComponent

Video.js is a JavaScript and CSS library that makes it easier to work with and build on HTML5 video