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• All About Search Indexing Robots and Spiders - Search Tools Consulting explains how the search engine programs called "robots" or "spiders" work, and reviews related sites.
  (Added: Tue Jun 01 2004)

• HTTP User Agent Index - An alphabetical list of user agents and the deployer behind them, compiled by Christoph Rüegg.
  (Added: Tue Jun 01 2004)

• List of Robot Agent Strings - A list from PGTS of Web robots with the identifying data they leave in Web site logs.
  (Added: Tue Jun 01 2004)

• Psychedelix List of User-Agents - Andreas Staeding's large list of search engine spiders, similar Web robots, and Web browsers: their web-log identification and links to their originators.
  (Added: Tue Jun 01 2004)

• Robots, Spiders and Other User Agents: a Resource for WebMasters - José Luis Pellicer's searchable database of robots, spiders and other user agents for programs that surf the web.
  (Added: Tue Jun 01 2004)

• Robots.txt Syntax Checker - Online tool for syntax verification to robots.txt files, provided by Simon Wilkinson.
  (Added: Tue Jun 01 2004)

• Search Engine IP Addresses - Lists IP addresses of search engine spiders. Can be searched by IP address. Also links to resources on spiders.
  (Added: Tue Jun 01 2004)

• Search Engine Robots and Other User Agents - 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.
  (Added: Tue Jun 01 2004)