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 * **[Open Site Explorer](//moz.com/researchtools/ose/):** Use Open Site Explorer to identify link building opportunities. Research backlinks, identify top pages, view social activity, and analyze anchor text.
 * **[Piwik](//piwik.org/):** is an open analytics platform
 * **[SEMrush](//www.semrush.com/):** SEMrush is a powerful and versatile competitive intelligence suite for online marketing, from SEO and PPC to social media and video advertising research.
+* **[SimilarWeb](//www.similarweb.com/):** Compare website traffic with SimilarWeb.com's advanced traffic estimator tool. See any website's traffic sources & uncover their online marketing strategies.
 * **[Twitter Analytics](//analytics.twitter.com/):** Measure and boost your impact on Twitter.
 * **[Yahoo Web Analytics](//web.analytics.yahoo.com):** is Yahoo!’s alternative to the dominant Google Analytics.