data thief for scientists

 xyscan is a tool for the scientist in the need to extract data points,
 i.e. numeric values, from a plot. It allows you to scan the plots and
 extract data points including the size of the error bars (both in x
 and y). It can handle plots with linear and logarithmic scales. In
 fact xyscan can be used for extracting numeric values from any kind
 of 2D technical drawings.