Intercom on Customer Engagement - A book on how to create messages that drive engagement
The Big Book of Churn - The definitive guide to customer churn reduction
Customer.io Actions - Send messages across any channel - from push to postcards
Customer.io - We make it easy to send emails triggered by user behavior. Build, measure and improve your emails to activate and retain users
Segment Sources - Load CRM, billing, and other cloud data to your Warehouse
Postmark - Postmark is the easiest and most reliable way to be sure your important transactional emails get to the inbox. Simply & reliably parse recieved email to JSON for your webapp.