RetailMenot - The RetailMeNot mobile app allows you to find deals on the go for both online shopping and in store shopping.
Proof - Website conversion rate optimization and visitor monitoring
Honey - Honey is a browser extension that automatically finds and applies coupon codes at checkout with a single click.
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.
Slickdeals.net - Slickdeals: The Best Deals, Coupons & Discounts on everything
Fomo - Fomo turns your site into the online equivalent of a busy store