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Thermocron iButton Manager is a set of bash-scripts providing simple tools and even a simple user interface for managing and setting up Thermocron iButtons and to extract and visualize the logged data.
To plot graphs from the logged temperature data RRDtool is used. Make sure it is installed in your *nix environment. For Cygwin go to the RRDtool Download page and download the windows binaries. Extract the zip-file (e.g. rrdtool-1.2.30-win32-perl510.zip) - you will find the rrdtool.exe binary in the subfolder data/rrd2/rrdtool-1.2.30/Release