Go.com - http://go.com
Go.com, formerly InfoSeek, offers a variety of advanced search options, links to current news and to reference sources, and subject searching through a subset of its index. One of the more popular search engines on the web, it has about 30 million in its index.
Hotbot - http://www.hotbot.com
HotBot has been growing rapidly in popularity. At 110 million, it has one of the two biggest indexes on the web, and it provides powerful refining options for searching by media type and geographic location. A favorite of researchers.
Lycos - http://www.lycos.com
Lycos, at 30 million, is also one of the more popular search engines on the web. It was among the first to offer searching by subject and media type and to provide reviews of selected sites ("Top 5%"). Lycos' advanced search has a broad range of syntax options.
MetaCrawler - http://www.metacrawler.com
The oldest metasearcher, and still the most popular, MetaCrawler searches nine large indexes, eliminates duplicates, and presents the results in ranked order. The address verification is worth the slightly longer processing time. Some advanced features.
ProFusion - http://www.profusion.com/
From the University of Kansas, ProFusion has a bare-bones visual style. It searches your choice of nine search engine indexes, removes duplicates and ranks results. Some Boolean searching and optional address verification are also available.