LoveSales - Find and save products you love, get alerted when they go on sale.
RetailMenot - The RetailMeNot mobile app allows you to find deals on the go for both online shopping and in store shopping.
TrackIf - Alerts you if the price of your favorite products drop
Dealspotr - Dealspotr is like Wikipedia for deals.
Giftwhale - Giftwhale allows you to create personalised wish lists online.
Discount Reactor - Find the best selected coupon codes, hot deals, fresh promotions and great special offers from more than 2634 stores at DiscountReactor