ERuby

From Site5Wiki

eRuby is a type of implementation that embeds Ruby into HTML or any other text document. Ruby code embedded in an HTML document, similar to ASP, JSP and PHP, requires an interpreter to execute and replace it with designated HTML code and content.

-- Answers.com

The extension of these files is .rhtml.

• Ruby and the Web -- scan down to the "Embedding Ruby in HTML" subsection
• Embedding Ruby in HTML eRuby: Getting Started with Ruby on the Web
• raa.ruby-lang.org/project/eruby
• Shell commands for eRuby

Related wiki pages: Ruby, Rails, Ruby on Rails, XHTML