Dialpad - Switch is a cloud-based phone system built for Google Apps users.

Aircall - Aircall is a call center software of a new generation designed for fast growing companies. Setup instantly and integrates to your CRMs

RingDNA - RingDNA is a provider of cloud based inside sales productivity and marketing intelligence software such as call tracking, dialers, and IVR.

3CX - Hosted PBX with CRM integration and mobile apps

GlobalMeet Collaboration - From cloud PBX to conference calls and meetings to online events, GlobalMeet is a business communications platform that helps take you where you need to go.

CallTrackingMetrics - Know who is calling and how they found you. Maximize the return on your advertising.