mFax - mFax is a cloud-based fax solution for sending and receiving faxes from any device.
RingCentral - RingCentral is the leading provider of cloud-based communications and collaboration solutions for small business and enterprise companies
Hellofax - Easy. Reliable. Online faxing. Send & receive faxes from anywhere.
Dialpad - Switch is a cloud-based phone system built for Google Apps users.
eFax - Over 11 million people use eFax every day for their fax communications.
Aircall - Aircall is a call center software of a new generation designed for fast growing companies. Setup instantly and integrates to your CRMs