Optimizely - A/B testing you'll actually use.
SEMRush - All-in-one Marketing Toolkit for digital marketing professionals.
VWO - Use VWO to tweak, optimize & personalize your website with minimal IT help.
Screaming Frog SEO Spider - The Screaming Frog SEO Spider is a small desktop program (PC or Mac) which crawls websites’ links...
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.
Pulno - SEO Audit and Website Analysis. Pull up your SEO.