Invoca - Call tracking & analytics software
Octopush - Octopush is a company providing technology-based communication solutions, including SMS, Web solutions, and Email APIs.
CallTrackingMetrics - Know who is calling and how they found you. Maximize the return on your advertising.
Clearstream - Clearstream is a SMS marketing and online texting software.
Marchex - Marchex is a mobile advertising analytics company that connects online behavior to real-world, offline actions.
Swift SMS Gateway - SMS Gateway is your bridge between the Internet and the world of cell phone SMS text messaging.