Amio Messaging SDK - Develop for multiple messengers using JavaScript
TextBlast Bulk SMS - Send personalized mass messages easily
Notif.me SDK - A Node.js lib to send all your transactional notifications
Porterhouse - Send mass iMessage and SMS texts from your existing number with a single click!
Postman for Mac (Beta) - Build, test, and document your APIs faster
LoopMessage - LoopMessage is a perfect macOS tool for personalized mass messaging via iMessage/SMS, WhatsApp, Facebook Messenger, Telegram, Viber, and Skype.