Additional Web search tools, internet subject directories, organize the sites they index into categories and subcategories (such as Arts and Humanities and Music, respectively). After browsing the categories and subcategories, selection of a subcategory results in a listing of several potential sources put together by editors who choose, evaluate, and index the sites that go inot the resource's database. So, unlike search engines and meta-search engines, subject directories are compiled by humans. Many directories also lists references such as almanacs, calenders, and provide links to electronic books and newspapers.
Two general subject directories that may be helpful to you are the Librarians Index to the Internet (lii.org) and the Internet Public Library (ipl.org) sponsored by the School of Information at the University of Michigan. Click below to access these sites.