AllTheWeb
AllTheWeb aims to index the entire web. It was the first search engine to break the 200 million web page index milestone. The Norwegian company behind AllTheWeb also powers some of the results that appear at Lycos.

Alta Vista
AltaVista is consistently one of the largest search engines on the web in terms of pages indexed. Its comprehensive coverage and wide range of power searching commands makes it a particular favorite among researchers. It also offers a number of features designed to appeal to basic users.

AOL Search

Ask.com

Google
Google is a search engine that makes heavy use of link popularity as a primary way to rank web sites. Google also has a huge index of the web and provides some results to Yahoo and Netscape Search.

LookSmart
LookSmart is a human-compiled directory of web sites.

Overture
Unlike the other major search engines, Overture sells its main listings. Companies can pay money to be placed higher in the search results, which Overture feels improves relevancy.