Microformat

hRecipe is a simple, open, distributed format, suitable for embedding information about recipes for cooking in (X)HTML, Atom, RSS, and arbitrary XML.

Rich Snippets allows you to enhance your Google search results by marking up web pages with Microformats, RDFa or Microdata.

Ufxtract is a microformats API that can easily extract microformats from any web page. It can output the results in JSON, XML or text format. There is JSON-P support for use with JavaScript.
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ARC is a flexible RDF system for semantic web and PHP practitioners. It's free, open-source, easy to use, and runs in most web server environments.

Oomph: A Microformats Toolkit is for web developers, designers and users, making it easier to create, consume, and style Microformats. Oomph makes consuming and producing content for the web just a little easier, more efficient, more fun. Now featuring Oomph2!