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Twilio - Brings voice and messaging to your web and mobile applications.
TextBlast Bulk SMS - Send personalized mass messages easily
Bandwidth - Bandwidth offers SIP trunking, Emergency communications, and Voice & Messaging APIs.
LoopMessage - LoopMessage is a perfect macOS tool for personalized mass messaging via iMessage/SMS, WhatsApp, Facebook Messenger, Telegram, Viber, and Skype.
Nexmo - Nexmo is a simple two way SMS API with global reach and wholesale rates
Porterhouse - Send mass iMessage and SMS texts from your existing number with a single click!