Q-Stats - Get free marketing insights for every question on Quora.
Optimizely - A/B testing you'll actually use.
Seoxan - check seo report for any website, alexa ranking, server information, meta tags, authority, page speed and more
VWO - Use VWO to tweak, optimize & personalize your website with minimal IT help.
HypeStat - HypeStat is free statistics and analytics service, where you can find information about every website.
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.