Zero Bounce is a WordPress plugin that forces your visitors to go to any URL you wish after they click on the back button. With this plugin you can turn lost traffic (i.e. traffic that was otherwise leaving your website) into profit. Or you get an extra change to convince them to perform your desired Call To Action.
Thrive Leads is a WordPress plugin to easily create, place and split test any kind of opt-in and lightbox popup forms on your WordPress site. You can define exactly where, when and how your opt-in forms are shown. It has some great extra features as highly effective built-in split testing, analyzing and reporting tools. A must have plugin to build your list faster and get more targeted lists.
WP Empire Builder 3.0 is a WordPress plugin that allows you to manage and launch multiple WordPress sites from within one dashboard installed on your main WordPress site. You can launch multiple sites, fully-loaded with all your favorite plugins and themes within 30 seconds.