"AWS SDK for Ruby provides a library, code samples, and documentation for developers to build Ruby applications that tap into the cost-effective, scalable, and reliable AWS cloud.
With the AWS SDK for Ruby, developers get started in minutes using AWS infrastructure services, including Amazon Simple Storage Service (Amazon S3), Amazon Elastic Compute Cloud (Amazon EC2), Amazon SimpleDB"
Ruby crawling library, based on nokogiri. Lets you navigate a website and submit forms, handle cookies etc…
"HTML, XML, SAX, & Reader parser with the ability to search documents via XPath or CSS3 selectors… and much more "