Twilio - Brings voice and messaging to your web and mobile applications.
Plivo - Plivo simplifies your customer engagement.
smooch - Smooch connects your business software to all the world’s messaging channels for a more human customer experience.
MessageBird - Reach 7 billion phones in seconds via SMS, Chat & Voice. Try it for free and improve your communication.
Bandwidth - Bandwidth offers SIP trunking, Emergency communications, and Voice & Messaging APIs.
TeleSign - TeleSign offers end-to-end communications Platform as a Service.