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Twilio - Brings voice and messaging to your web and mobile applications.
Asterisk - An open source telephony switching and private branch exchange service for Linux.
Clockwork SMS - Clockwork is an Easy Text Message API. An SMS API for Developers. Build powerful apps and include SMS. Signup is free, Try it now.
FreeSWITCH - FreeSWITCH is an open-source media application designed to support popular protools such as SIP and WebRTC and provides a platform to develop voice and video applications.
MessageBird - Reach 7 billion phones in seconds via SMS, Chat & Voice. Try it for free and improve your communication.
FusionPBX - FusionPBX is an open source FreeSWITCH GUI.