GetX Gnuplot Software For Windows Free. Itis a rather handy software application that allows you to create graphs in a simple manner. With the help of this tool, one can create graphs from mathematical functions in a short span of time. The tool is designed for expert users and will require a little bit of guidance initially. The interface is intuitive but with a ton of advanced options. You will find it to be an expert application in its own league. The fact that it is available in a portable version is an added bonus.