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.
CallTrackingMetrics - Know who is calling and how they found you. Maximize the return on your advertising.
Dialpad - Switch is a cloud-based phone system built for Google Apps users.
Marchex - Marchex is a mobile advertising analytics company that connects online behavior to real-world, offline actions.