More than 70% of all online shoppers abandon their carts. Jilt.com helps you recover those lost sales with cart abandonment emails.
Stunning is a service which hooks up to your stripe account and recoveres failed payments for you.
Optinmonster is a great way of collecting more leads. They will give you a variety of ways to do exactly that: you can build popups by drag and drop, add timers, adapt when they are triggert and much more.