WebDriver is a tool for writing automated tests of websites. It aims to mimic the behaviour of a real user, and as such interacts with the HTML of the application.

Capybara is an integration testing tool for rack based web applications. It simulates how a user would interact with a website

Poltergeist is a driver for Capybara that allows you to run your tests on a headless WebKit browser, provided by PhantomJS.

Headless Webkit driver for Capybara

Webrat lets you quickly write expressive and robust acceptance tests for a Ruby web application. It supports simulating a browser inside a Ruby process to avoid the performance hit and browser dependency of Selenium or Watir, but the same API can also be used to drive real Selenium tests when nec...

Watir stands for Web Application Testing In Ruby It facilitates the writing of automated tests by mimicing the behavior of a user interacting with a website.

Headless is a Ruby interface for Xvfb. It allows you to create a headless display straight from Ruby code, hiding some low-level action.

SitePrism gives you a simple, clean and semantic DSL for describing your site. SitePrism implements the Page Object Model pattern on top of Capybara.

WebDriver-backed Watir

Culerity integrates Cucumber and Celerity in order to test your application's full stack.

Celerity is a JRuby wrapper around HtmlUnit – a headless Java browser with JavaScript support. It provides a simple API for programmatic navigation through web applications. Celerity provides a superset of Watir's API.

Official Ruby Client for Selenium RC.

The "official" Selenium On Rails repository, synced with OpenQA.

Cuprite is a driver for Capybara that allows you to run your tests on a headless Chrome browser

Headless Browser for Integration Testing with Capybara

Selenium RC with Rails integration and enhanced assertions.

Simple page objects for Capybara. All tooth-generated methods return Capybara Elements so that you can use these familiar objects for your needs.