Optimizely - A/B testing you'll actually use.
Codezero - Collaborative Local Microservices Development
VWO - Use VWO to tweak, optimize & personalize your website with minimal IT help.
LeadMD - LeadMD is the revenue performance consultancy that cuts through the BS by making your vision actionable and your outcomes measureable
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.
Sirius - An open-source clone of Siri from UMICH