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Twilio - Brings voice and messaging to your web and mobile applications.
Smooch.io for Facebook Messenger - Message your customers from Slack, Front, a bot or anywhere!
Bandwidth - Bandwidth offers SIP trunking, Emergency communications, and Voice & Messaging APIs.
GetChat.App - Add WhatsApp chat to your website for free
Nexmo - Nexmo is a simple two way SMS API with global reach and wholesale rates
Avochato - Text messaging for your business.