Chatfuel - Chatfuel is the best bot platform for creating an AI chatbot on Facebook.

Intercom - Intercom is a customer relationship management and messaging tool for web businesses. Build relationships with users to create loyal customers.

Landbot - An intuitive no-code conversational apps builder that combines the benefits of conversational interface with rich UI elements.

JivoChat - JivoChat is a live chat that enables you to talk to visitors on your website

ChatBot - Easy to use chatbot platform for business

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