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.
Soovle - Soovle is a customizable search engine provides the search suggestion of the best provider on the net.
Google Trends - Explore Google trending search topics with Google Trends.
Usetiful - Fight user churn with great user onboarding. Interactive product tours and smart tips significantly improve your user retention.
KeywordTool.io - KeywordTool.io is the best FREE alternative to Google Keyword Planner and Ubersuggest. It uses Google's autocomplete feature to get over 750+ long-tail keywords for any given query.
Keywords Everywhere - Free browser add-on for keyword volume, CPC & competition