Pragma - The home base for Ethereum developers.
WhatsMany - Send personalised WhatsApp messages in bulk
Telnyx SMS API - Build global text messaging right in your app
LoopMessage - LoopMessage is a perfect macOS tool for personalized mass messaging via iMessage/SMS, WhatsApp, Facebook Messenger, Telegram, Viber, and Skype.
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!