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.

Crisp Chat - Multi-channel customer support software

Airmail - Airmail is a lightweight and lightning fast mail client for Mac.

FLEX - An in-app debugging and exploration tool for iOS.

Spark Mail - Spark helps you take your inbox under control. Instantly see what’s important and quickly clean up the rest. Spark for Teams allows you to create, discuss, and share email with your colleagues