GiftBuster - Wish list registry & shopping list app
Gift Hero - The best wish list ever
Mystery Gift Bot - Don't think about what to buy, let it be a mystery
ThoughtfulGiftList - A simple gift list app
Giftwhale - Giftwhale allows you to create personalised wish lists online.
Honey - Honey is a browser extension that automatically finds and applies coupon codes at checkout with a single click.