JGE Automatic Content Generator is a PHP script that will automatically add relevant content to existing web pages. Uses Calais to perform semantic analysis of an existing page's content to find essential keywords and then pull content relevant to these keywords from Freebase.
The Google App Engine team has been consistently rolling out a new release every month recently. They have become so consistent in doing so, that new releases probably do not make that much of a splash. However, the team has pleasantly surprised everyone by delivering on one of the most requested features that developers had asked from their PaaS platform: Search. Yes, you read that right.
This past Valentine's Day, DuckDuckGo announced via Twitter that their search engine had "received over 1,000,000 direct searches yesterday for the first time ever!" A major accomplishment for a search engine that is essentially unknown. And this search engine has an API.