Crazy Egg - Through Crazy Egg's heat map and scroll map reports you can get an understanding of how your visitors engage with your website so you can boost your conversion rates.
Splitly - Splitly is an A/B testing tool for Amazon FBA sellers.
Optmyzr - Optmyzr AdWords Tools. Optimization Solutions, Quality Score Tracker, Landing Page Checker, and more. Free Trial Available.
MerchantWords - MerchantWords is a keyword tool for Amazon merchants.
Freshmarketer - An all-in-one CRO suite.
SellerTools - SellerTools help you boost conversion rates with optimized listings, maximize the value of paid and organic traffic.