tawk.to - tawk.to is a free live chat app that lets you monitor and chat with visitors on your website or from a free customizable page
OnWhatsApp - Create your online catalog, receive orders on WhatsApp 🛒
ChatWoot - Open-source omnichannel customer engagement platform
WhatsApp Chat for Shopify - Convert website visitors into customers with WhatsApp Chat
Intercom - Intercom is a customer relationship management and messaging tool for web businesses. Build relationships with users to create loyal customers.
Slack with your Users - Speak to your app's users entirely within Slack