SoChat - Chat with everyone
Dialpad - Switch is a cloud-based phone system built for Google Apps users.
chitchat - Chat Room with Selfies and Pagers (yes, pagers!)
RingCentral - RingCentral is the leading provider of cloud-based communications and collaboration solutions for small business and enterprise companies
Talk Turkey - Instant message interviews
Aircall - Aircall is a call center software of a new generation designed for fast growing companies. Setup instantly and integrates to your CRMs