Polymail - Native email app for email productivity.
Tripcatcher - Tripcatcher is a mileage app to keep track of travel expenses.
Airmail - Airmail is a lightweight and lightning fast mail client for Mac.
Traxo - Traxo is a online travel tool that helps users automatically create and keep travel itinerary up-to-date.
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
Concur - Automated travel and expense management - your employees, travel managers and finance, too.