Pagewiz - An innovative landing page platform that lets you create, publish, and split-test landing pages.
SiteGainer - SiteGainer is an A/B testing and conversion optimization platform.
AdBasis - A/B and multivariate ad testing software
Splitly - Splitly is an A/B testing tool for Amazon FBA sellers.
GrowthGiant - GrowthGiant enables marketers to increase their website sales and conversions by continuous A/B testing.
Optimizely - A/B testing you'll actually use.