CartHook - Recover abandoned carts with email

RetailMenot - The RetailMeNot mobile app allows you to find deals on the go for both online shopping and in store shopping.

CartHero - Recover abandoned checkouts with SMS, discounts, and customer service

Slickdeals.net - Slickdeals: The Best Deals, Coupons & Discounts on everything

Retainful - Automate Email Marketing & Increase eCommerce Sales Automate your email campaigns in minutes - recover abandoned carts, drive repeat purchases with next order coupons, win-back inactive customers, send order follow-ups, and thank you emails.

Honey - Honey is a browser extension that automatically finds and applies coupon codes at checkout with a single click.