GetChat.App - Add WhatsApp chat to your website for free
OnWhatsApp - Create your online catalog, receive orders on WhatsApp 🛒
Smooch.io for Facebook Messenger - Message your customers from Slack, Front, a bot or anywhere!
WhatsApp Chat for Shopify - Convert website visitors into customers with WhatsApp Chat
Avochato - Text messaging for your business.
Chaskiq - Turn strangers into leads, maintain data ownership. Easy to install, develop, and measure.