Visual Website Optimizer (VWO) is a comprehensive testing tool that covers A/B testing as well as the following features:

• Multivariate testing
• Split URL testing
• Heatmap/Clickmap
• Targeting/Segmentation
• Revenue Tracking
• Usability testing. Users can get quantitative feedback and improvement ideas on what they should be A/B testing
• Enterprise security options such as whitelisting office IPs for login and realtime activity notifications to administrator
• Free 30 day trial without requiring a credit card.
• Numerous other small features such as test labels, test organization, frequently used goals, roles/permissions, account management, reports exportable to CSV/PDF, etc.