NewsWhip - Chrome extension that checks how viral your content is
Optimizely - A/B testing you'll actually use.
Today on the Internet 💘 - Most shared GIFs, Images and Videos of the Internet
VWO - Use VWO to tweak, optimize & personalize your website with minimal IT help.
Sprinkles - Sprinkles lets you build a microsite, engage with your audience, and own your data.Export your data and host it on your servers whenever you want.(P.S.
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.