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Plot Digitizer - All-in-One Tool to Extract Data from Graphs, Plots & Images
Engauge Digitizer - This open source, digitizing software converts an image file showing a graph or map, into numbers.
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.
g3data - g3data is used for extracting data from graphs.
DigitizeIt - Sometimes it is necessary to extract data values from graphs, e.g.
Silkscientific UN-SCAN-IT - Digitizing Software converts graph image files to usable (x,y) data automatically