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Twilio - Brings voice and messaging to your web and mobile applications.
Octopush - Octopush is a company providing technology-based communication solutions, including SMS, Web solutions, and Email APIs.
Plivo - Plivo simplifies your customer engagement.
Clearstream - Clearstream is a SMS marketing and online texting software.
Nexmo - Nexmo is a simple two way SMS API with global reach and wholesale rates
Swift SMS Gateway - SMS Gateway is your bridge between the Internet and the world of cell phone SMS text messaging.