Today's web search engines need to combine search results from many independent sources, such as results from a Web crawl, from Advertisements, from Video's, Books, News, Shopping, etc. Searsia provides an approach to search that:
UTwente Search is an enterprise search engine for the University of Twente that combines the results of more than 40 sources, including results from Google's web crawl, from Courses, from News, the Telephone directory, the Timetables, as well as results from social media, such as Facebook, Twitter and Flickr.
Dr. Sheet Music is a federated search engine dedicated to sheet music. It combines the results of more than 50 resources, including advertisements from affiliate programs like Amazon, eBay and ShareASale and advertisements for charities like CharityChoice and GoedeDoelen.nl.