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