HTML5, CSS3, Microdata, Meta Tags, Twitter Card Generator & Facebook Open Graph.
http://webcodetools.com
Webcodetools.com has HTML5, CSS3, Meta Tags and Microdata generators (and more coming in the future) to help anyone create a modern website. Preview your code live, and copy-paste it into your site’s code.

HTML (HyperText Markup Language)
Markup language used to create web pages.
CSS (Cascading Style Sheets)
Style language used to add style to HTML.
Meta Tags
Meta tags provide basic metadata about web pages.
Microdata
Similar to meta tags, but microdata is more specific and is nested within the content of a web page.
Guys at coffeecup are awesometacular.