There's lots of helpful information locked away in databases that can never be indexed by search engines. The services below let you search this "invisible web" or "deep web."
InvisibleWeb.com
From Intelliseek, the makers of the BullsEye meta search software, InvisibleWeb.com catalogs searchable resources across the web. Also used for the Lycos Invisible Web service, below.
Lycos Invisible Web Catalog
Produced in partnership with Intelliseek, this search engine gives you access to all sorts of online databases.
Direct Search
http://www.freepint.com/gary/direct.htm
A large collection of specialized search tools that often contain info that is hidden to search engines. Lovingly compiled by search expert Gary Price.
WebData
Comprehensive guide to searchable databases. Browse or search through listings.
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