Aircall - Aircall is a call center software of a new generation designed for fast growing companies. Setup instantly and integrates to your CRMs
Invoca - Call tracking & analytics software
RingDNA - RingDNA is a provider of cloud based inside sales productivity and marketing intelligence software such as call tracking, dialers, and IVR.
DialogTech - DialogTech is an end-to-end call attribution and conversion platform.
Dialpad - Switch is a cloud-based phone system built for Google Apps users.
CallTrackingMetrics - Know who is calling and how they found you. Maximize the return on your advertising.