Ad Badger - Amazon PPC tool for optimizing campaigns
Savelist - Found products you want but not ready to buy?
Sellics - Sellics helps you to boost Your Amazon sales.
Camelcamelcamel - Easily monitor Amazon product prices and get alerts when they drop.
NinjaSEM - PPC management software
Price Snoop - When viewing a product on Amazon, Price Snoop will show you just how much it costs on the other...