Psychedelix.com's List of User-Agents is a very large, comprehensive and updated list of search engine spiders, similar Web robots, Web Crawlers and Web browsers. They provide additional information relating to their respective web-log identification as well as links to their originators.
Visit List of User-Agents (Spiders, Robots, Browsers)
Highly Recommended for All Web Publishers:
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Reviews of selected top internet advertising networks:
