Examine their criteria carefully. HotBot can search for graphics, sounds, movies, etc. MathSearch will search for pages on college level mathematics. MetaCrawler can be customized to search for pages from a particular geographical region. Government sites are cataloged in GovBot .
Galaxy can search for resources available with telnet and gopher .
Liszt is an index of Internet mailing lists . COM can search for mailing lists, news postings, and Web forums. Beaucoup offers a page that can search major newspapers and magazines. Infoseek also has a Web directory of rated sites. On the results page from any search, Infoseek provides a button to perform sub-searches.