This listing has a decent overview. http://www.seoconsultants.com/search-engines/history/ Admin Note: The authors of the above search engine history summary do not claim that the dates indicated are 100% accurate. We've researched multiple documents from various resources and have ascertained that the dates above are an approximation based on the search engine history information we've obtained. Some dates represent inception of the search engine or directory. Other dates are actual launch dates where the search engine or directory was made available to the public.