Yodle!

"Send targeted emails to your users and subscribers with Customer.io's intuitive editor and powerful tracking features. Rich CSS-based templates simplify the process of designing compelling layouts. Built-in analytics lets you classify mailing list recipients by their attributes, pageviews, and site interactions. Advanced emails use A/B testing, structured data merging, and third-party APIs to engage users with personalized messages that add value to your service."

SparkPage is a Lifecycle Marketing platform for Web & Mobile Apps that lets marketers build messaging workflows with Emails, Sms and Push Notifications, and provides A/B testing which ups conversion.