WebPlotDigitizer
im2graph
DataThief III
Silkscientific UN-SCAN-IT
GraphClick
jTechDig
Plot Digitizer
g3data is used for extracting data from graphs.

This generic SOAP client allows you to access web services using a your iOS app, Mac OS X app and AppleTV app. - priore/SOAPEngine

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g3data
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| Website | frantz.fi | github.com |
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When comparing g3data and SOAPEngine, you can also consider the following products.
WebPlotDigitizer - Web based tool to extract numerical data from plots, images and maps.
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im2graph graph digitizing software to convert graphs to numbers
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DataThief III is a program to extract (reverse engineer) data points from a graph.
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Digitizing Software converts graph image files to usable (x,y) data automatically
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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.
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Software tool written in Java for digitizing data from an image of graph or plot.
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