Novocall - Novocall converts web visitors into sales calls in seconds.
Chatfuel - Chatfuel is the best bot platform for creating an AI chatbot on Facebook.
Inbound Rocket - Converts visitors into leads, subscribers & customers
BotStar - BotStar | Engage Customers Online with Live Chat & Chatbots
Sheety - Turn any Google sheet into an API instantly, for free. Power websites, apps, or whatever you like, all from a spreadsheet. Changes to your spreadsheet update your API in realtime. Neat
Telegram bot API - The Bot API allows you to easily create programs that use Telegram messages for an interface.