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.
Website Informer - Website.informer: complete data lookup & free aggregated report on any domain including whois, visitors, IP & DNS details, competitors, owners, etc
Google Analytics - Improve your website to increase conversions, improve the user experience, and make more money using Google Analytics. Measure, understand and quantify engagement on your site with customized and in-depth reports.
LiveIntent - LiveIntent is a web platform that offers effective e-mail advertising services for marketers and publishers.
SEO camel - A very complete SEO tool that helps you with optimization on your site.