nginx [engine x] is a HTTP server and mail proxy server written by Igor Sysoev.
Ruby on Rails is an open-source web framework that is optimized for programmer happiness and sustainable productivity. It lets you write beautiful code by favoring convention over configuration.
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The DOCTYPE is a required preamble for HTML5 websites.
Websites using https protocol.
The Open Graph protocol enables any web page to become a rich object in a social graph, a open protocol supported by Facebook
Open graph description entity tag
Open graph image entity tag
UTF-8 (8-bit UCS/Unicode Transformation Format) is a variable-length character encoding for Unicode. It is the preferred encoding for web pages.
Wesites using favicon rel tag