Google AJAX APIs
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Google AJAX APIs is a javascript library to integrate rich, multimedia, search, or feed-based Internet content into web applications/pages, organized by Google. Anyone can utilize them to easily place in rich AJAX content into web pages simply by adding tiny amounts of JavaScript code.
This Library contains many applications which are growing day by day.
Google Maps API
Add a google map to a web page.
Google AJAX Search API
Integrate Google search into a web site
Google AJAX Feed API
Download Atom and RSS feeds from any server using only JavaScript.