0 What are available options in ruby in support of Selenium?

There are various drivers in ruby that provides implementation for Selenium WebDriver specification.

This includes: 

1. Selenium-WebDirver     
2. Watir-WebDriver     
3. Capybara
4. PantomJS and probably many more...

We would be using Watir-WebDriver in our examples. Once Watir-WebDriver is learned, the rest of the WebDrivers implementations should not be difficult for you to explore and find out. 

See what Wikipedia has to say about Watir Webdriver:

A must read article. I liked the author’s explanation on differences between the options we have mentioned above for Selenium automation in ruby:  ->>Find Here<<-