Monodraw is an editor for Mac that lets you design ASCII art and create diagrams, mind maps, banners, and more. From the website: “Monodraw allows you to easily create text-based art (like diagrams, layouts, flow charts) and visually represent algorithms, data structures, binary formats and more. Because it’s all just text, it can be easily embedded almost anywhere. Of course, exporting as images is also supported (PNG and SVG).” You can download a free trial or buy a license for US$$9.99.
Check It Out: ‘Monodraw’ is a Multi-Purpose Mac ASCII Editor