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Collusion is an experimental add-on for Firefox and allows you to see all the third parties that are tracking your movements across the Web. It will show, in real time, how that data creates a spider-web of interaction between companies and other trackers.

Spinn3r is a web service for indexing the blogosphere. We provide raw access to every blog post being published - in real time. We provide the data, and you can focus on building your application, mashup, or search engine. We find the weblogs and RSS, index their content, fetch the links, index their comments, etc.