Adobe Target - Adobe Target provides an intuitive user interface and an expanded personalization toolset.
Optimizely - A/B testing you'll actually use.
Chartbeat - Chartbeat shows you real-time traffic to your website and allows you to set alerts for any downtime or spikes in traffic.
Growth Book - The Open Source A/B Testing Platform
Webtrends Optimize - Webtrends Optimize - a powerful, enterprise-grade Testing and Personalisation platform. AB, MVT & Server-side Testing, Product Recommendations & much more.
invesp Pii Testing Engine - invesp Pii testing engine offers A/B testing solution for site optimization.