AmzScope - Find profitable products for sale on Amazon in one click, relying on statistics instead of intuition
Ad Badger - Amazon PPC tool for optimizing campaigns
AMZScout - AMZScout extension will help you make a decision about picking a niche based on the actual data, not intuition.
Sellics - Sellics helps you to boost Your Amazon sales.
Jungle Scout - Amazon product research made easy.
NinjaSEM - PPC management software