What are some alternatives?
When comparing Botfuel and Zendesk Answer Bot, you can also consider the following products
Conversational Form - Turning web forms into conversations. By SPACE10
IBM Watson Assistant - Watson Assistant is an AI assistant for business.
Aivo - Skyrocket your Customer Service and Sales KPIs with a Chatbot powered by Artificial Intelligence. Give time back to people.
Dialogflow - Conversational UX Platform. (ex API.ai)
Next IT - Next IT is a virtual assistant that help companies deliver the perfect online customer experience.