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RedBOT - Resource Expert Droid (HTTP Header Status Checker Tool).

The Web Robots Pages > Robots.txt - Learn everything about 'robots.txt' and the 'Robots Exclusion Protocol'.

Wayback machine - Internet Archive is a non-profit digital library offering free universal access to 150 billion archived web pages.

Open Site Explorer - Link Popularity and Backlink Analysis Tool from SeoMOZ.

Copyscape Plagiarism Checker - Duplicate Content Detection Software

Redirect Checker - Search Engine Friendly Redirect Checker Tool.