Extract data from graphs - Webplotdigitizer

I have used several tools to extract date from graphs in journals.  Datathief is/was good, but its shareware.  I have started using WebPlotDigitzer.  WebPlotDigitizer work within a browser - it's also free, though donations are accepted.  I prefer to determine how much software is worth to me.  This gets the job done.

Tabula - Extract Data from tables in PDFs

A useful tool.  Everyone sometimes has to use data that is in a table in a PDF.  This little tool will extract that data into a CSV file.  It beats retyping - and as you probably know pasting from a pdf can be a problem!  Take a look here, OS X and Windows versions are available.