Yeloni is a free wordpress plugin that adds popups on your website. This popup will appear only when the user is leaving your website and is one of the best ways to retain and engage a leaving visitor.
This video shows you how to install the basic free wordpress plugin and quickly enable popups on your website.
Download & Install: https://wordpress.org/plugins/yeloni-free-exit-popup/
Premium Extensions: http://yeloni.com/yeloni-premium-features.php