The script requires Perl with Device::SerialPort (would probably also work with Win32::SerialPort), GD, Date::Time, Time::Hires and File::Slurp.
On the One and Only Linux Distribution (and its friends) the following command should make you ready to go: sudo aptitude install libdevice-serialport-perl libgd-gd2-perl libdatetime-perl libtime-hires-perl libfile-slurp-perl
The script has built-in documentation and help using POD. Say ./wintectool --man (or perldoc wintectool) to read it.
It is Free Software under the Artistic License. See the documentation for details.