Wickr - Wickr is a free end-to-end encrypted text, video, picture and voice messenger with full sender...
RingCentral - RingCentral is the leading provider of cloud-based communications and collaboration solutions for small business and enterprise companies
Burn Note - Burn Note is the name of a continuous private messaging utilizing which you can have an ongoing private discussion with your companions or any individual who is at Burn Note.
Dialpad - Switch is a cloud-based phone system built for Google Apps users.
Signal - Fast, simple & secure messaging. Privacy that fits in your pocket.
Aircall - Aircall is a call center software of a new generation designed for fast growing companies. Setup instantly and integrates to your CRMs