Optimizely - A/B testing you'll actually use.
A2X - A2X automates ecommerce accounting for Shopify, Amazon, Etsy, Walmart and eBay sellers worldwide. Trusted by hundreds of leading ecommerce accounting firms.
invesp Pii Testing Engine - invesp Pii testing engine offers A/B testing solution for site optimization.
Helium 10 - Our software contains multiple Amazon seller tools to help you find high ranking keywords, identify trends, spy on competitors, & optimize product listings.
Splitly - Splitly is an A/B testing tool for Amazon FBA sellers.
Jungle Scout - Amazon product research made easy.