Capitan - AI powered shopping list: Never forget anything at the store
LoveSales - Find and save products you love, get alerted when they go on sale.
Bring - Clever shopping - simple and shared
TrackIf - Alerts you if the price of your favorite products drop
GiftBuster - Wish list registry & shopping list app
Giftwhale - Giftwhale allows you to create personalised wish lists online.