WordPress Landing Pages
http://wordpress.org/plugins/landing-pages/
Create landing pages for your WordPress site. Monitor and improve conversion rates, run A/B split tests, customize your own templates and more.
WordPress Landing Pages works as a standalone plugin or hand in hand with WordPress Calls to Action & WordPress Leads to create a powerful & free lead generation system for your business.
*Varianty*
Convert Experiments by Yoast
https://wordpress.org/plugins/convert-experiments/
Convert Experiments™ provides advanced A/B and MVT Testing functionality for your website or blog.
The plugin will automatically send the page type, page name, category name, category ID, and tags to Convert Experiments. A/B testing on any set of categories or pages is then easy with the advanced filtering and segmentation during test configuration.
