Below is a list of some of the most popular search engines

Google - uses text-matching techniques to find pages that are both important and relevant to your search.
Yahoo! - portal providing a category-based Web directory.
Excite - is a global media company offering consumers and advertisers comprehensive Internet navigation services with extensive personalization capabilities. Search services include the Excite and WebCrawler brands.
AltaVista - web and newsgroup search engine.
HotBot - offers users a point-and-click interface, pulldown menus, and the ability to use plain English terminology for constructing searches.
Study Web - comprehensive searchable categorized index with reviews of over 17,000 educational and reference Web sites. Great for students and educators alike.
WebCrawler - WebCrawler analyzes hundreds of millions of web sites to deliver you the most relevant and popular search results. We constantly check for and remove dead links and repeat entries to ensure that you have the best possible search experience.
About.com - extensive network of sites by subject specialists who write articles, host discussions, publish free email newsletters and provide personally-reviewed links for each topic.
Northern Light - The Northern Light research engine uses patented classification intelligence and precision relevancy ranking to improve Web searching.
NetGuide - your daily guide to the net
MetaCrawler - search service that relies on the databases of other search engines.
Metafind - searches through all the large search engines and collates results.
Dogpile - multi-engine semi-parallel search interface. Searches logically through several search engines until 10 matches are found. Allows use of boolean and proximity operators.
CNET Search - offers channels to metasearch specialized engines from around the Web
SavvySearch - sends your query to many search engines simultaneously, and the results can be displayed in any of several languages.
Mamma - mother of all search engines.
ProFusion - Search the Top 1000 Search Sources and get the BESTresults!
Search.com - online forms for most major and minor search engines from CNET.
All-in-One Search Page - the Internet's best search engines, databases, indexes, and directories in a single site.
BigHub, The Ixquick Metasearch - Forwards searches to a user selected list of top search engines. Ranks results based on number of occurances in queried engines.