Webmaster Tools is a no-charge web service by Google,Yahoo, Bing and others search engine for webmasters. It allows webmasters to check indexing status and optimize visibility of their websites. Webmaster tool provide information about site indexed by search engine or not , keyword information , internal and external link information, site performance , search query, hold information about robot.txt file Check and set the crawl rate and lot of more this a webmaster done by help of webmaster tool. Here a list of some most used webmaster tool:



Google webmaster tool.



Yahoo webmaster tool.



Bing webmsater tool http://amplify.com/u/bsz5l