HoverSignal - Increase your website's conversions with notifications
NotificationX - Best social proof and FOMO marketing solution for WordPress to increase conversion rates.
AnyMailFinder.com - Find anyone's email address
Nudgify - Nudgify is a Social Proof App that includes FOMO, Urgency and Review Nudges. Adding Social Proof notifications to your site helps you build trust and increase conversions on Shopify, Wordpress or any other platform.
Hunter - Find all the email addresses related to a domain
Fomo - Fomo turns your site into the online equivalent of a busy store