AltaVista, Excite, Lycos, Infoseek, Webcrawler, Yahoo. Boolean searching is with buttons or symbols. MetaCrawler's power search allows narrowing by geographical location or educational, governmental or commercial sites. MetaCrawler has an interesting feature called Metaspy . Profusion claims to be able to analyze your search terms and pick the best three search engines .
Filters results to remove duplicates and broken links.
Profusion has good Boolean searching capabilities. One of the unique features of Profusion is the Personal Assistant . Dogpile, Inference Find, MetaCrawler, and Metafind.