RoboRep - Create conversational chatbots with empathy
Twilio - Brings voice and messaging to your web and mobile applications.
CSML Playground - Play with CSML, the programming language for chatbots
Swift SMS Gateway - SMS Gateway is your bridge between the Internet and the world of cell phone SMS text messaging.
ChatBot - Easy to use chatbot platform for business
Maytapi - Serverless Whatsapp Api with Chat and Agent support.