10 moteur de recherche pour explorer le web invisible:

http://infomine.ucr.edu/
http://vlib.org/
http://aip.completeplanet.com/aip-engines/browse?thisPage=%2Fbrowse%2Fbrowse.jsp&successPage=%2Fbrowse%2Fbrowse.jsp&errorFlag=&errorMsg=&event=loadPageEvent&directPage=&directSection=4&treeQueryExpr=&treeQueryType=phrase&treeQueryTarget=tree
http://www.infoplease.com/index.html
http://www.incywincy.com/
http://www.deepwebtech.com/
http://www.scirus.com/srsapp/
http://www.intute.ac.uk/