Optimizely - A/B testing you'll actually use.
SiteGainer - SiteGainer is an A/B testing and conversion optimization platform.
VWO - Use VWO to tweak, optimize & personalize your website with minimal IT help.
Experiment Engine - Experiment Engine is a A/B testing solution that harnesses human expertise to automate conversion optimization.
Chartbeat - Chartbeat shows you real-time traffic to your website and allows you to set alerts for any downtime or spikes in traffic.
Intellimize - Convert more. Optimize and personalize for every website visitor.