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Robots.txt File Generator - tools.seobook.com

http://tools.seobook.com/robots-txt/generator/
Looking to test your robots.txt file? Try our robots.txt analyzer or; Read more about robots.txt files. Gain a Competitive Advantage Today. Your top competitors have been investing into their marketing strategy for years.
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Robots.txt validator and testing tool - Ryte, Inc.

https://en.ryte.com/free-tools/robots-txt/
The robots.txt file. The robots.txt file is a simple text file used to inform Googlebot about the areas of a domain that may be crawled by the search engine’s crawler and those that may not.
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Webmaster tools available for Yahoo Search | …

https://help.yahoo.com/kb/SLN2213.html
Webmaster tools available for Yahoo Search. You can manage how your website appears in Yahoo Search by using meta tags and robots.txt. Yahoo Search results come from the Yahoo web crawler (Slurp) and Bing's web crawler.
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Google のクローラ(ユーザー エージェント) - …

https://support.google.com/webmasters/answer/1061943?hl=ja
robots.txt のユーザー エージェント. robots.txt ファイルの中で、複数のユーザー エージェントが見つかった場合は、最も限定的なものに従って Google のクロールが行われます。
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