LoopMessage - LoopMessage is a perfect macOS tool for personalized mass messaging via iMessage/SMS, WhatsApp, Facebook Messenger, Telegram, Viber, and Skype.
WhatsApp - WhatsApp Messenger: More than 1 billion people in over 180 countries use WhatsApp to stay in touch with friends and family, anytime and anywhere.
WhatsMany - Send personalised WhatsApp messages in bulk
BetterChat for WhatsApp - Gorgeous new full-featured WhatsApp client for the Mac.
Promote Route - A Better WhatsApp™ Experience
RELE.AI - RELE.AI is the first enterprise Virtual Bot Assistant, allowing you to document client conversations and interact with your CRM without ever leaving WhatsApp (desktop & mobile).