Search Tools Consulting explains how the search engine programs called "robots" or "spiders" work, and reviews related sites.
http://www.searchtools.com/robots/
Andreas Staeding's large list of search engine spiders, similar Web robots, and Web browsers: their web-log identification and links to their originators.
http://www.psychedelix.com/agents.html
John A. Fotheringham presents data in tabular form on the robots sent by search engines and other sites to read and index Web pages: their origins, names and IP addresses.
http://www.jafsoft.com/searchengines/webbots.html
Tracks and displays real time hits and IP addresses of MSNbot, Yahoo's Slurp, and Googlebot. Provides aggregate hits of each spider over the last 30 days.
http://www.spidertrack.org
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