The world first search engine was Shodan, This was the first search engine that all internet connection devices could use.This search engine had enable users to find specific type of computer through webcam,servers or router by using a variety of fillers to access and be connected to the internet.
After this first there have been other search engines that have been developed and used though Google search engine still remains the giant of them all,there include:
Bing owned by Microsoft for users searching pleasure.
ask.com: This sesrch engine is in the Question and answers format
Buidu: search engine mostly used in China
Yahoo.com: This is a search engine powered by bing
DuckDuckGo This another good sesrch engine that has really good interface.