What are some alternatives?
When comparing Microsoft Bot Framework and Amazon Lex, you can also consider the following products
Botpress - Open-source platform to create, manage and extend bots
IBM Watson Assistant - Watson Assistant is an AI assistant for business.
Dialogflow - Conversational UX Platform. (ex API.ai)
Tars - TARS enables users to create chatbots that replaces regular old webforms.
Chatfuel - Chatfuel is the best bot platform for creating an AI chatbot on Facebook.
ManyChat - ManyChat lets you create a Facebook Messenger bot for marketing, sales and support.