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.
Smooch.io for Facebook Messenger - Message your customers from Slack, Front, a bot or anywhere!
WhatsApp Business - Communicate more efficiently with your customers
GetChat.App - Add WhatsApp chat to your website for free
WhatsApp Chatbots by SendPulse - No-code chatbots and shared inbox for WhatsApp
Avochato - Text messaging for your business.