Flamelink.io - Flamelink.io is a headless CMS for Firebase.
RetailMenot - The RetailMeNot mobile app allows you to find deals on the go for both online shopping and in store shopping.
Contentful - You don't need another CMS. You need a better way to manage content — unified, structured, and ready to deploy to any digital channel.
Honey - Honey is a browser extension that automatically finds and applies coupon codes at checkout with a single click.
Strapi - Strapi is the most advanced Node.
Slickdeals.net - Slickdeals: The Best Deals, Coupons & Discounts on everything