WebPlotDigitizer is recommended for researchers, scientists, data analysts, and students who frequently need to extract data from published graphs and charts. It is particularly useful in fields such as biology, engineering, physics, and any other areas where visual data needs to be quantitatively analyzed.
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Plot Digitizer - All-in-One Tool to Extract Data from Graphs, Plots & Images
DiskPatch - Did the entire hard disk go blank? Does Windows complain that the volume needs to be formatted?
DigitizeIt - Sometimes it is necessary to extract data values from graphs, e.g.
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GraphClick - GraphClick is a graph digitizer shareware for Mac OS X which allows to automatically retrieve the original (x,y)-data from the image of a scanned graphor fom QuickTime movies.