Gift Hero - The best wish list ever
LoveSales - Find and save products you love, get alerted when they go on sale.
Buckitron - Marketplace for bucket list experiences
TrackIf - Alerts you if the price of your favorite products drop
Wishfinity Browser Extensions - Add to your universal wishlist with a single click
Giftwhale - Giftwhale allows you to create personalised wish lists online.