Intercom - Intercom is a customer relationship management and messaging tool for web businesses. Build relationships with users to create loyal customers.
Chatfuel - Chatfuel is the best bot platform for creating an AI chatbot on Facebook.
GoSquared Live Chat - Beautiful, simple, and free live chat for your website
BotStar - BotStar | Engage Customers Online with Live Chat & Chatbots
Live Chat by Sumo.com - Instantly communicate with customers, prospects & visitors
Telegram bot API - The Bot API allows you to easily create programs that use Telegram messages for an interface.