RingCentral - RingCentral is the leading provider of cloud-based communications and collaboration solutions for small business and enterprise companies
CallHippo - Easy to use Phone System with World-Class Support
Dialpad - Switch is a cloud-based phone system built for Google Apps users.
Loop Communications - Loop Communications provides hosted VoIP business phone systems to small businesses and mid-sized companies.
Aircall - Aircall is a call center software of a new generation designed for fast growing companies. Setup instantly and integrates to your CRMs
Vonage - Vonage is a cloud-based all-in-one VoIP software solution designed for multiple industries such as accounting, healthcare, finance and marketing etc.