Algunos ejemplos son DogPile (http://www.dogpile.com), Mamma (http://www.mamma.com), MetaCrawler (http://www.metacrawler.com), Profusion (http://www.profusion.com), SavvySearch (http://www.savvysearch.com), Zinternet (http://www.zinternet.com) o Chubba (http://www.chubba.com).