Draw.io is a free online tool to create diagrams (like the simple one above.)
That's it. Online tools (like exhibit components) are often at their best when they do just one thing well.
Draw.io is fun and easy to use, and a great way to create mockups for screen-based interfaces or other lable-y and prototype-y things.
Check it out at the draw.io website and start playing around with the varied and extensive tool sets.
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