Helium 10 - Our software contains multiple Amazon seller tools to help you find high ranking keywords, identify trends, spy on competitors, & optimize product listings.
Camelcamelcamel - Easily monitor Amazon product prices and get alerts when they drop.
Jungle Scout - Amazon product research made easy.
Fetchee - Fetchee is a free price tracking wish list app that works with all online stores worldwide.
Reviewbox - E-commerce data tool to monitor customer reviews, track online pricing, optimize AMS tools, and more from Amazon, Walmart, and other major online retailers.
Keepa - Price history charts and the option to be alerted on price drops for all Amazon sites.