Optimizely - A/B testing you'll actually use.
Lander - Lander is a powerful online tool to create Landing Pages.
Adobe Target - Adobe Target provides an intuitive user interface and an expanded personalization toolset.
Inbound Now - Build Landing pages, manage inbound leads, and create calls to actions to improve marketing with our Inbound Marketing Plugins for WordPress
AB Tasty - AB Tasty is an all-inclusive platform for conversion rate optimization, personalization, customer activation, and testing.
Pagewiz - An innovative landing page platform that lets you create, publish, and split-test landing pages.