Botletter - Botletter enables users to send newsletters on Facebook Messenger.
RetailMenot - The RetailMeNot mobile app allows you to find deals on the go for both online shopping and in store shopping.
SendPulse - Maximizing e-mail marketing open rates automatically
Honey - Honey is a browser extension that automatically finds and applies coupon codes at checkout with a single click.
Publicate - Build Beautiful Emails. Export and Send Anywhere.
Slickdeals.net - Slickdeals: The Best Deals, Coupons & Discounts on everything