st2gif is a command line converter for converting Atari-ST images into .gif files. It generates them using GD.
You could call it "neo2gif" or "pi12gif" or ...
st2gif is run as following:
st2gif <INPUT_FILE> [<OUTPUT_FILE>]
st2gif reads the file defined by the first parameter, determining the type from the extension (.pi1, .pi2, .pi3, and .neo are recognized), converts it into a gif and saves the gif using either the second parameter as name, if given, otherwise the first parameter where the extension is replaced by ".gif".
st2gif is licenced under the GPL (other licences are available :-)
st2gif is written in pure C and tested on normal PCs under Windows and Linux. Should compile on other platforms, too.
I am not sure the application is useful for anything, or really does what is told above. I am also not sure whether it really will not harm you or thing you own. But it worked once for me.