Annotate screenshot
2 open-source tools on osfeed do this, in 2 ways. Each entry says how, and where it falls short. Read the tool's page before you rely on it.
Draw arrows, lines, rectangles, text, freehand strokes and highlights on a screenshot.
Limit Takes an image file or stdin; it does not capture the screen itself, so it is paired with grim and slurp.
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