Optimizely - A/B testing you'll actually use.
Growth Book - The Open Source A/B Testing Platform
VWO - Use VWO to tweak, optimize & personalize your website with minimal IT help.
SiteGainer - SiteGainer is an A/B testing and conversion optimization platform.
Chartbeat - Chartbeat shows you real-time traffic to your website and allows you to set alerts for any downtime or spikes in traffic.
108 Proven Split Test Winners - Simple tweaks to make to your website, to make more money!