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Botsociety - Botsociety is a tool to design, preview and export your chatbot.
Dia - Dia is a GTK+ based diagram creation program for GNU/Linux, MacOS X, Unix, and Windows, and is released under the GPL license.
Balsamiq Mockups 3 - New public beta for the popular prototyping tool
draw.io - Online diagramming application
Bots UI Kit - Fully customizable Sketch UI Kit for Messenger Platform
yEd - yEd is a free desktop application to quickly create, import, edit, and automatically arrange diagrams. It runs on Windows, Mac OS X, and Unix/Linux.