Search Engine is a program designed to help find information stored on a computer system such as the World Wide Web, inside a corporate or proprietary network or a personal computer. The search engine allows one to ask for content meeting specific criteria (typically those containing a given word or phrase) and retrieves a list of references that match those criteria.
Gigablast - A powerful, new search engine that does real-time indexing. LookSmart - Directory split into a number of vertical search sites, each on its own domain. Company profile and information for searchers, publishers and advertisers.