1. https://www.google.com
2.http://www.bing.com/
3.http://search.yahoo.com/
4.http://www.ask.com/
5.http://search.aol.com/aol/webhome
6.http://www.wow.com/
7.http://www.webcrawler.com/
8.http://home.mywebsearch.com/index.jhtml
9.http://infospace.com/
10. https://duckduckgo.com/
11.http://blekko.com/
12.http://www.contenko.com/
13.http://www.dogpile.com/
14.http://www.alhea.com/
15.https://www.yandex.com/