LoopMessage - LoopMessage is a perfect macOS tool for personalized mass messaging via iMessage/SMS, WhatsApp, Facebook Messenger, Telegram, Viber, and Skype.
Intercom - Intercom is a customer relationship management and messaging tool for web businesses. Build relationships with users to create loyal customers.
WhatsMany - Send personalised WhatsApp messages in bulk
Carrd - Simple, responsive one-page site creator.
Promote Route - A Better WhatsApp™ Experience
Avochato - Text messaging for your business.