What are some alternatives?
When comparing Microsoft Bot Framework and BotUI, you can also consider the following products
Botpress - Open-source platform to create, manage and extend bots
Conversational Form - Turning web forms into conversations. By SPACE10
Dialogflow - Conversational UX Platform. (ex API.ai)
Botsify Conversational Forms - Lead generation forms for chatbots
Amazon Lex - Harness the power behind Amazon Alexa for your own conversational apps.
chatform.ai - Turn your web forms into conversations on any messaging app