KOOKOO - All in one solution for calls, IVR, live chat, customer management & more.
RingCentral - RingCentral is the leading provider of cloud-based communications and collaboration solutions for small business and enterprise companies
Dialfire - Cloud Calling at Jet Speed
Melrose Labs CloudPBX - Advanced Hosted Cloud PBX for Your Team.
Aircall - Aircall is a call center software of a new generation designed for fast growing companies. Setup instantly and integrates to your CRMs
Dialpad - Switch is a cloud-based phone system built for Google Apps users.