Largest database of webpagesPopular search engine and subject directory
Popular search engine run by Microsoft
Meta-search engines compile and sort results from multiple search engines.
Meta-search engine which brings together top results from Google, Yahoo!, and Bing
Meta-search engine which compiles top results from search engines like Google, Yahoo!, MSN Live, and Ask.com
Google's search engine for scholarly sources
Subject directories are resources for specific topics.
Large collection of subject guides for academic disciplines and specific research topics - list both online resources and printed reference works.Collections of resources from the Internet Public Library (IPL) and the Librarians' Internet Index (LII).