Intercom - Intercom is a customer relationship management and messaging tool for web businesses. Build relationships with users to create loyal customers.
LoopMessage - LoopMessage is a perfect macOS tool for personalized mass messaging via iMessage/SMS, WhatsApp, Facebook Messenger, Telegram, Viber, and Skype.
Carrd - Simple, responsive one-page site creator.
TextBlast Bulk SMS - Send personalized mass messages easily
Avochato - Text messaging for your business.
Texted.io - Send text blasts to groups, receive individual replies