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Site Rank Data - View historical rank information of websites via time series charts.
SimilarWeb - SimilarWeb.com is a website analysis tool that gives you analytics information for any website.
Q-Stats - Get free marketing insights for every question on Quora.
cutestat - Website Stats and Valuation. CuteStat.
Seoxan - check seo report for any website, alexa ranking, server information, meta tags, authority, page speed and more