Polymail - Native email app for email productivity.
RingCentral - RingCentral is the leading provider of cloud-based communications and collaboration solutions for small business and enterprise companies
Airmail for iOS - One of the best Mac email clients, now on iPhone
Dialpad - Switch is a cloud-based phone system built for Google Apps users.
Airmail - Airmail is a lightweight and lightning fast mail client for Mac.
Aircall - Aircall is a call center software of a new generation designed for fast growing companies. Setup instantly and integrates to your CRMs