RetailMenot - The RetailMeNot mobile app allows you to find deals on the go for both online shopping and in store shopping.
DontPayFull - Verified coupons and discounts for a variety of online retailers.
ebates - Find thousands of coupons, promo codes and discounts.
Dealspotr - Dealspotr is like Wikipedia for deals.
link-o-mat - Cashback Portal - Verdiene mit linkomat Cashback - weltweit über 9500 Shops
Honey - Honey is a browser extension that automatically finds and applies coupon codes at checkout with a single click.