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Jasmin SMS Gateway - Jasmin is a very complete open source SMS Gateway with many enterprise-class features such as:
MessageBird Voice API - Add programmatic call capabilities to your app or service
Ozeki NG SMS Gateway - Ozeki NG SMS Gateway is a powerful, reliable and flexible SMS Gateway application.
MessageBird Chat API - Connect with your customers through different messaging apps
Kannel - Open Source WAP and SMS Gateway
Voiceflow - Build voice apps in your browser without coding