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Monodraw
Plain text has been around for decades and it's here to stay. Monodraw allows you to easily create text-based art (like diagrams, layouts, flow charts) and visually represent algorithms, data structures, binary formats and more.
The rectangle tool can be used to create all kinds of boxes which are the most commonly used element in text art. Specify border or a background with just a few clicks. Last but not least, custom attachment points will help you attach your lines at exactly the right place.
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