Aircall - Aircall is a call center software of a new generation designed for fast growing companies. Setup instantly and integrates to your CRMs
CallTrackingMetrics - Know who is calling and how they found you. Maximize the return on your advertising.
RingDNA - RingDNA is a provider of cloud based inside sales productivity and marketing intelligence software such as call tracking, dialers, and IVR.
CallFire - Grow your business with virtual phone numbers, IVR, voice broadcasting, mass text messaging services and power dialing.
Dialpad - Switch is a cloud-based phone system built for Google Apps users.
Invoca - Call tracking & analytics software