Query, filter, and join data across Web services through one simple language. Eliminate the need to learn how to call different APIs.
Access data from all these sources and more.
YUI is a library of JavaScript utilities and controls for building richly interactive web applications using techniques such as DOM Scripting, DHTML, and Ajax.
Yahoo! PlaceFinder converts street addresses and place names into geographic coordinates.
BOSS is Yahoo!'s open search web services platform. Developers can use BOSS to build and launch web-scale search products that utilize the entire Yahoo! Search index.
The Yahoo! Application Platform allows developers to reach Yahoo! users and improve the Yahoo! user experience by building and deploying new applications directly onto Yahoo! pages.

Today we're pleased to announce the availability of our new Content Analysis service through YQL. Content Analysis replaces Yahoo!’s popular Term Extraction service and now provides advanced content analysis on either text or a URL, leverages Yahoo!’s state of the art MLR technology to extract key terms from the content, and, more importantly, to rank them based on their overall importance to the content.