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Plot Digitizer - All-in-One Tool to Extract Data from Graphs, Plots & Images
WebPlotDigitizer - WebPlotDigitizer - Web based tool to extract numerical data from plots, images and maps.
Engauge Digitizer - This open source, digitizing software converts an image file showing a graph or map, into numbers.
DigitizeIt - Sometimes it is necessary to extract data values from graphs, e.g.
DataThief III - DataThief III is a program to extract (reverse engineer) data points from a graph.
g3data - g3data is used for extracting data from graphs.