Google Tag Manager - Google Tag Manager helps make tag management simple, easy and reliable by allowing marketers and webmasters to deploy website tags all in one place.
Optimizely - A/B testing you'll actually use.
Tealium iQ Tag Management - Tealium is a dynamic platform that comes with a highly extensible iQ Tag Management system to manage mission-critical technologies with ease and comfort.
VWO - Use VWO to tweak, optimize & personalize your website with minimal IT help.
Piwik PRO Marketing Suite - Piwik PRO is a marketing suite dedicated to enterprise clients.
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.