Intercom - Intercom is a customer relationship management and messaging tool for web businesses. Build relationships with users to create loyal customers.
Polymail - Native email app for email productivity.
Drift - A messaging app that helps you grow your business.
Airmail for iOS - One of the best Mac email clients, now on iPhone
HelpSpace - The team inbox with super powers
Airmail - Airmail is a lightweight and lightning fast mail client for Mac.