AstroPlot is a Scripts software developed by astroplot. After our trial and test, the software is proved to be official, secure and free. Here is the official description for AstroPlot:

Marydown Editor: AstroPlot is our small, fast and free tool for visualizing 2D data, slightly inclined towards usage in astronomy.

With AstroPlot you can:
Plot any number of data-files and functions
MOVE around your data by zooming and panning
Decorate your plots using various colors, fonts and different drawing styles
Export your plot as a picture or print it