Robots.txt Generator
- Information on the use of robots.txt as well as a robots.txt generator and a list of search engine robots.
- http://www.robotstxt.ca/

Robots.txt Validation
- Creator and validator of robots.txt files.
- http://www.clockwatchers.com/robots_tool.html

Robots.txt Checker
- Analyzes a robots.txt file searching for syntax and "logical" errors, and shows a summary of what effect it will have.
- http://tool.motoricerca.info/robots-checker.phtml

Robots.txt Syntax Checker
- Online tool for syntax verification to robots.txt files, provided by Simon Wilkinson.
- http://www.sxw.org.uk/computing/robots/check.html