Kameleoon!

Google Analytics Content Experiments is a prominent feature in Google Analytics that allows for A/B testing. It used to be a seperate product called Google Website Optimizer.

Convertize is a conversion optimisation platform based on consumer psychology, enabling you to sell more, faster.We believe that Consumer Psychology is the key to enhancing customer experience.

Adobe Test&Target gives marketers a website optimization tool with the necessary capabilities to continually make their online content and offers more relevant to their customers yielding greater conversion. Test&Target provides an intuitive interface for designing and executing tests, creating audience segments, and targeting content.