Botmock - Effortlessly design your Facebook chatbots
UX Flow Wireframe Prototyping System - Create beautiful user flows prototypes for your next project
Botsociety - Botsociety is a tool to design, preview and export your chatbot.
draw.io - Online diagramming application
Chatfuel - Chatfuel is the best bot platform for creating an AI chatbot on Facebook.
UMLGraph - UMLGraph is a professional automated drawing tool that allows the designers the declarative specification and drawing of UML class and sequence diagram.