Follow the subject links . This is maintained by librarians who have found informative sites on the web. R un by students at the University of Michigan School of Information, this site acts as a library on the web. The largest directory on the web functions much like a search engine. Each subject area is maintained by a different person or institution.
Linked sites tend to be very academic.
Searchable by keyword or subject headings. Commercial and popular categories. Searchable by subject. Search by keyword or subject. Directory for the Humanities from the University of California, Santa Barbara.