RingCentral - RingCentral is the leading provider of cloud-based communications and collaboration solutions for small business and enterprise companies
SalesWise - A gorgeous launchpad for sales people
Dialpad - Switch is a cloud-based phone system built for Google Apps users.
Call Automation in Close.io - A power dialer built inside your CRM
Aircall - Aircall is a call center software of a new generation designed for fast growing companies. Setup instantly and integrates to your CRMs
Close - A CRM with built-in calling, SMS, and email