Scribe is an SEO service that analyzes your content and tells you how you can make it better for search engines and get ranked higher. The service has been available for Drupal and WordPress for a while. A message about Joomla! support has been seen on the Scribe SEO site for a couple of months or so.
Today, the free Scribe SEO extension for Joomla was released.
The extension has been developed by the guys over at JoomlaShack in coorporation with Scribe SEO.